Having a trip abroad is certainly good for the old couple, but it remains ______ whether they will enjoy it.

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问题 Having a trip abroad is certainly good for the old couple, but it remains ______ whether they will enjoy it.

选项 A、to see
B、to be seen
C、seeing
D、seen

答案B

解析这是一个主语从句。it作形式主语，whether they will enjoy“作真正的主语。remain后接to do sth. 作表语。see与主语从句是动宾关系，所以此处要用to be seen，表将来。

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