It is by no means clear the president ca...

It is by no means clear the president can do to end the strike.

A．how

B．which

C．that

D．what

D 【解析】考察形式主语句。It是形式主语，真正的主语是后面的what the president can do to end the strike, what引导起这个主语从句，并且作为do的宾语。句意：总统能够做什么来制止罢工一点也不清楚。故D正确。

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