题目内容

no modern equipment and technology, human would not explore space and deep sea.

A. Were
B. Had there been
C. If there are
D. If there have been

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If Mr. Zhongpresent, he would have offered any possible medical assistance to the people in need.

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the morning bus, he would not have been late for the graduation ceremony.

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A. would have some
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A. went
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