单项选择题

I appreciated ______ to the United States to study five years ago.

A. to have sent
B. be sent

C. being sent
D. to have been sent
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单项选择题
Many students suggested ______ a boat trip on the Huangpu River.
A. to organize
B. organize
C. organized
D. organizing
单项选择题
Sometimes very young children have trouble ______ fact from fiction and may believe that such things actually exist.
A. separating B. having separated
C. to separate
D. for separating
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