_______ on earth do you suppose_______ this?A.What; could doB.What; could have doneC.Who; doD.Who; could have done
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D解析试题分析：句意：你究竟认为谁能做这件事？这里是特殊疑问句，do you suppose是插入语，插入语的语序必须是陈述语序，这里正好疑问词作主语，做事必须是某人来做所以排除AB，这里who做主语时，谓语动词应该用单数，故排除C。所以应选D。考点：考查插入语的用法。
点评：本题难度适中。插入语在近几年的高考中经常出现，有插入语的句子增加了试题的难度，考生如果分不清插入语与句子的其他成分，很容易判断错误；这里考生容易误选C。即学即练：Many people thought little of me，but I did what______.A.I thought I was right B.I thought it was rightC.I thought was right D.I was thought right解析：C。句意：把插入语I thought抽掉，然后观察句子，