问题补充：
It is by no means clearthe president can do to end the strike.
A. how
B. which
C. that
D. what
答案：
A. how
B. which
C. that
(答案→)D. what
解析：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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