单项选择题

It is absolutely necessary for us to have sufficient oxygen if we （）to go on living

A. are
B. were
C. had
D. having

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The population of Shanghai is （） city in China.

A. bigger than any
B. as big as any other
C. bigger than that of any other
D. bigger than any other
单项选择题
If you had worked hard before, you （） worried about the coming examination now.

A. would not be
B. would not have been
C. are not
D. will not be
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