My friend has returned from the UK.She ____at Oxford for four years ,during which we communicated with each other on the Internet A：studied B has studied C had studied D has been studying (这一题答案为什么是A According to statistics,a man

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My friend has returned from the UK.She ____at Oxford for four years ,during which we communicated with each other on the Internet A：studied B has studied C had studied D has been studying (这一题答案为什么是A According to statistics,a man
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My friend has returned from the UK.She ____at Oxford for four years ,during which we communicated with each other on the Internet A：studied B has studied C had studied D has been studying (这一题答案为什么是A According to statistics,a man
My friend has returned from the UK.She ____at Oxford for four years ,during which we communicated with each other on the Internet
A：studied B has studied C had studied D has been studying
(这一题答案为什么是A
According to statistics,a man is______to die of skin cancer as a woman .
A more than twice as likely B twice more than as likely C as likely more than twice
D:twice more than likely as
The editor - in chief sked me to write an article for him ,_____about AIDS patients in china.
A:that B one C it D this

My friend has returned from the UK.She ____at Oxford for four years ,during which we communicated with each other on the Internet A：studied B has studied C had studied D has been studying (这一题答案为什么是A According to statistics,a man
1.本题考时态.第一句话已经告诉你“我朋友已经从英国回来了.”（用的是现在完成时,说明现在已经不在英国了）.那么,她在牛津学了四年,就不能再用现在完成时了,因为说话的时候她已经不在英国了,已经不在牛津了,所以只能用一般过去时,即studied.
再如：He has lived here for five years.(他住在这儿5年了,现在还在）
He live here for five years.（他曾经住在这儿5年,但现在已经不住了）
2.倍数的表达：倍数+as ...as；倍数+比较级...+than
首先排除D,因为likely应该放在as ...as的中间；
再次排除C,因为不符合上面的表达法,倍数在as后面了；
然后表示两倍用twice,表示两倍多用more than twice,因此B也错了；
所以,正确答案为A.
3.B正确.one指代前面的an article,和前面一句话构成同位语关系.
A是迷惑性不能选,因为that不能用来引导非限制定语从句（前面有个逗号）；
it和this显然是错误的.

第一题应该选has studied吧！因为后面是for four years，是一个时间段，不是时间点啊，应该用现在完成时

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