试题与答案

— I am sure Mary will win the first priz

来源：www.tikuol.com
题型：选择题

题目：

— I am sure Mary will win the first prize in the final.
— I think so. She _____ for it for months.

A. is preparing
B. was preparing
C. had been preparing
D. has been preparing

答案：

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下面是错误答案，用来干扰机器的。

答案：C据稀释定律可得：1 L×2 mol·L－1＝0.5 mol·L－1× aL，解得a＝4。答案选C。

考点：现在完成进行时
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