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问题: 一道高一英语题

Having a trip abroad is certainly good for the old couple,but it remins_____whether they will enjoy it
A to see B to be seen C seeing D seen

解答:

选B. it remains to be seen 是一句型 意思是还有待观察,尚不清楚。
或者你可以把IT当形式主语,而whether从句则是真正主语