The family of Mr. Smith ______ down to dinner.选择题The family of Mr. Smith ______ down to dinner.A.has just sat B.has just seatedC.have just been sitting D.has just been seating说明下原因,这样我记得牢

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The family of Mr. Smith ______ down to dinner.选择题The family of Mr. Smith ______ down to dinner.A.has just sat           B.has just seatedC.have just been sitting D.has just been seating说明下原因,这样我记得牢
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The family of Mr. Smith ______ down to dinner.选择题The family of Mr. Smith ______ down to dinner.A.has just sat B.has just seatedC.have just been sitting D.has just been seating说明下原因,这样我记得牢
The family of Mr. Smith ______ down to dinner.选择题
The family of Mr. Smith ______ down to dinner.
A.has just sat B.has just seated
C.have just been sitting D.has just been seating
说明下原因,这样我记得牢

The family of Mr. Smith ______ down to dinner.选择题The family of Mr. Smith ______ down to dinner.A.has just sat B.has just seatedC.have just been sitting D.has just been seating说明下原因,这样我记得牢
a
后面有down,所以只能选a或者c.史密斯一家已经坐下吃饭了 根据这个意思选择a,用been sitting 没有必要