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12. 選 D。根據句中的 didn’t let me drive 可知,這是一個與過去事實相反的虛擬語氣句,條件句的謂語用 had+過去分詞,主句謂語用 would / should / could / might have+過去分詞。
13. 選 C。as if 引導的句子,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。又如下面一題要選 C:
It seems as if the sun ____ round the earth since it rises in the east and sets in the west.
A. circles B. is circling
C. were circling D. has been circling
14. 選C。but for 的意思是“若不是,要不是”,用于引出與事實相反的假設,通常與虛擬語氣連用。根據句中的 the help you gave me,可知它表示與過去事實相反,故選C。
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