It is by no means clear ________ the president can do to end the strike.(2012·新課標(biāo)全國(guó))
A．howB．whichC．thatD．what
D
考查主語從句的連詞。根據(jù)從句可以看出這里do后缺少賓語，而且該句子沒有先行詞，It在句中作形式主語，可以判定這是主語從句，主語從句中缺少賓語，因此排除that和how；而which在名詞性從句中表選擇而且有一定的選擇范圍，該題沒有給出可供選擇的范圍，所以排除which，故選what。句意：總統(tǒng)能做什么來結(jié)束罷工根本不清楚。
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