题目

Having a trip abroad is certainly good for the old couple, but it remains _______ whether they will enjoy it. A. to see  B. to be seen   C. seeing      D. seen 答案：B 解析: remain 作“尚需”解，是连系动词，其后要接不定式作表语。由于 see 与 it(形式主语，指whether they will enjoy it)是动宾关系，因此用不定式的被动式。

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