It is by no means clear ________ the president can do to end the strike.(2012·新課標(biāo)全國，24)
A．howB．which
C．thatD．what
　D
解析　it是形式主語，空格后是一個主語從句，從句中的謂語動詞do缺少賓語，此處所填單詞既要引導(dǎo)主語從句，又在從句中作賓語，四個選項中有此功能的只有what。句意為：總統(tǒng)能采取什么措施來結(jié)束這場罷工根本不為人所知。
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