题目内容

It is by no means clear      the president can do to end the strike.
A．howB．which
C．thatD．what
D
此处it是形式主语，what引导的是主语从句，作真正的主语。What作do的宾语。句意：总统采取什么行动结束这次罢工一点也不清楚。
【考点定位】考查主语从句的连接词。
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