问题补充:
It remains whether the students will benefit from the monthly exams.
A. seeing
B. to be seen
C. to see
D. to have seen
答案:
A. seeing
(答案→)B. to be seen
C. to see
D. to have seen
解析:It remains to be seen (whether/what/how)以后才知道;尚不确定。选B.
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