12. The boy's parents    the operation last week had it not been for the donations from our school. 

A.    couldn't have paid for

B.    couldn't pay for

C.    shouldn't have paid for

D.    wouldn't pay for

12.   A考查非真實(shí)條件句的虛擬語氣。句意：要不是我們學(xué)校的捐款，這個男孩兒的父母上周不可能付清手術(shù)費(fèi)。根據(jù)句中已知的時間狀語last week，可排除B、D。而couldn't have

paid for意為"不可能付 "；shouldn't have paid for意為"本不應(yīng)該付……"。根據(jù)句意可知選A。

【拓展延伸】要不是：（l)but for...(介詞短語，與過去或現(xiàn)在事實(shí)相反）

(2)had it not been for ... = if it hadn't been for ...(與過去事實(shí)相反）

(3)were it not for... = if it were not for ...(與現(xiàn)在事實(shí)相反）

題目來源：2015全品語法快練高中英語新課標(biāo) > 訓(xùn)練23 情態(tài)動詞和虛擬語氣

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