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
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
B
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。