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The wonderful time they have been looking forward to__finally arrived. 急求!a. had b. have c. has d. having为什么选c而不选D呢?

题目详情
The wonderful time they have been looking forward to__finally arrived. 急求!
a. had b. have c. has d. having
为什么选c而不选D呢?
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答案和解析
答案:C
they have been looking forward to 是定语从句修饰前面的time,主语是time,所以谓语动词用单数形式.