A. masters B. should master C. mastered D. will master
分析: It 作形式主语, that 引导的主语从句中的谓语动词要用虚拟语气。
具体有以下几个方面:
1 .在主语从句中用来表示惊奇、怀疑、惋惜、理应如此等,谓语动词要用虚拟语气 (should)+do。 常用的句型有: It is necessary (important, natural, strange, etc.) thatIt is a pity (a shame, no wonder, etc.)that It is suggested (requested, proposed, desired, etc.)that 例如:
It is strange that she (should)think so. 真奇怪,她竟然这么想。
It is necessary that he (should)be sent there at once. 应该马上派他去那里。
It is suggested that Mr. Wang give a performance at the party. 有人建议王先生在晚会上演个节目。
2 .谓语动词是表示建议、请求、命令、要求、坚持等及物动词时,其后边的宾语从句要用虚拟语气。常用的这类动词有 suggest, propose, move, insist, desire, demand, request, order, command 等,谓语动词要用虚拟语气 (should)+do .例如:
I insist that she (should)do her work alone. 我坚持要她自己完成工作。
The commander ordered that troops (should)set off at once. 司令员命令部队马上出发。
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