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When a pencil is partly in a glass of water, it looks as if it ______.
A.breaksB.has broken
C.were brokenD.had been broken
C
as if 引导的句子,有时用虚拟语气,有时不用。原则上说,若指事实或可能为事实,不用虚拟语气;若指现在,从句谓语动词用一般过去时(be 用 were);若指过去用过去完成时,若指将来用过去将来时或用 were to do sth.
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