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It is by no means clear ________ the president can do to end the strike.(2012·新课标全国,24)
A.howB.which
C.thatD.what
 D
解析 it是形式主语,空格后是一个主语从句,从句中的谓语动词do缺少宾语,此处所填单词既要引导主语从句,又在从句中作宾语,四个选项中有此功能的只有what。句意为:总统能采取什么措施来结束这场罢工根本不为人所知。
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