题目内容

After ________ seemed a hopeless wait, four coal­miners trapped in the mine for 125 hours were finally rescued in Heilongjiang Province.
A．whenB．that
C．itD．what
D
D 考察名词性从句。句意：在经历了毫无希望的等待之后，黑龙江省4名被围困在井下长达125小时的煤矿工人终于被成功营救了上来。After后面的从句缺少主语成分，且指申请，应该使用what一词，故D正确。
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