题目内容
14.[1991全国] When and where to build the new factory ________ yet.
A. is not decided B. are not decided
C. has not decided D. have not decided
答案：A
提示：
提示：
题目考察主谓一致。主语为when和where引导的主语从句，所以其谓语应用单数动词
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23.[1991全国] I can hardly imagine Peter ________ across
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A. sail |
B. to sail |
C. sailing |
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