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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 引導(dǎo)的句子，有時用虛擬語氣，有時不用。原則上說，若指事實或可能為事實，不用虛擬語氣；若指現(xiàn)在，從句謂語動詞用一般過去時（be 用 were）；若指過去用過去完成時，若指將來用過去將來時或用 were to do sth.
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