The number of pandas _____ (be)getting smaller and smaller.

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The number of pandas _____ (be)getting smaller and smaller.
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The number of pandas _____ (be)getting smaller and smaller.
The number of pandas _____ (be)getting smaller and smaller.

The number of pandas _____ (be)getting smaller and smaller.
答案应是is.
the number of + 复数名词 + 动词单数 表示.的数量
a number of + 复数名词 + 动词复数 表示许多的,大量的
本题的意思是大熊猫的数量正在减少.所以用is.

The number of pandas are getting smaller and smaller.,

The number of pandas is/has been getting smaller and smaller.
只能是is或者has been,其他任何答案都是错误的。

has been
熊猫的数目已经越来越少了