问题
选择题
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
答案：B
remain 作“尚需”解，要接不定式作表语，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。