【題目】________ for the doctor’s careful treatment, he ________ till last year.

A. If it were not, can’t live

B. Were it not, couldn’t live

C. Had it not been, couldn’t have lived

D. If they were not, couldn’t live

【答案】C

【解析】

試題分析：考查虛擬語氣。句意：要不是這位醫(yī)生的精心治療，他不可能活到去年。另外的表達(dá)方式還有：①If it had not been for...②But for...，根據(jù)句意可知，與過去事實相反，if從句用過去完成時態(tài)，主句用could/might/should/would+have done，如果把if省去，則把助動詞had提到主語前面，故選C。

【知識拓展】

虛擬語氣的判斷：

1. if 條件狀語從句中虛擬語氣的判斷。if 條件狀語從句有真實條件句和非真實條件句。假設(shè)條件可以實現(xiàn)的句子為真實條件句，反之為非真實條件句，要用虛擬語氣。其形式分為以下三種：

(1) 與過去事實相反的假設(shè)。結(jié)構(gòu)為：從句的謂語動詞用“had + 過去分詞”，主句用“should (would, could, might) + have + 過去分詞”。例如：

If it had not rained so hard yesterday, we could have played tennis. 如果昨天沒有下大雨，我們就能玩網(wǎng)球了。

(2) 與現(xiàn)在事實相反的假設(shè)。結(jié)構(gòu)為：從句的謂語動詞用過去式，系動詞用were，主句的謂語用“should (would, could, might) + 動詞原形”。例如：

If I were in your position, I would marry her. 如果我是你，我就娶她為妻。

(3) 與將來事實相反的假設(shè)。結(jié)構(gòu)為：從句的謂語動詞用“should (were to) + 動詞原形”，主句用“should

(would, could, might) + 動詞原形”。 例如：

If you should miss the chance, you would feel sorry for it. 如果你錯過了這次機(jī)會，你會難過的。

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