问题补充:
We are taking action, but how effective it will remain .
A. to see
B. to be seen
C. seeing
D. seen
答案:
A. to see
(答案→)B. to be seen
C. seeing
D. seen
解析:考查remain的用法,remain to be done“仍然要被做”,句意是:我们正在采取行动,但是它的效果如何还有待证实。选B
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