It is by no means clear      the president can do to end the strike.
A．howB．which
C．thatD．what
D
此處it是形式主語(yǔ)，what引導(dǎo)的是主語(yǔ)從句，作真正的主語(yǔ)。What作do的賓語(yǔ)。句意：總統(tǒng)采取什么行動(dòng)結(jié)束這次罷工一點(diǎn)也不清楚。
【考點(diǎn)定位】考查主語(yǔ)從句的連接詞。
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