题目内容

The air quality in the city, ______ is shown in the report, has improved over the past two months.

A. that
B. it
C. as
D. what

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It is the third time that she has won the race, _______ has surprised us all.

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A. which
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A. when
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在( )中,补元是唯一的。

A. 有界格
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C. 分配格
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