I apologize if I__________you，but I assure you it was unintentional(無意的).?
A．offendB．had offended?
C．should have offendedD．might have offended?
B?
此題要求在if從句中選擇適當(dāng)?shù)膭?dòng)詞形式，以主句中的動(dòng)詞apologize(抱歉)來看，if從句中表達(dá)的內(nèi)容應(yīng)該是過去做的事，因此可以排除 A，因?yàn)?A項(xiàng)是現(xiàn)在時(shí)。 C項(xiàng)中should+have+過去分詞結(jié)構(gòu)表示本來應(yīng)該做卻沒有做的事，在此不合題意。D選項(xiàng)中的might+have+過去分詞表示對過去發(fā)生的事情很不肯定的猜測，它表達(dá)的內(nèi)容還不能成為事實(shí)，所以借此道歉真是不知從何說起，因此此處也不合題意。 B項(xiàng)had offended表示當(dāng)時(shí)已經(jīng)發(fā)生了的動(dòng)作。這是復(fù)雜條件句：apologize 是現(xiàn)在，而條件句是表示對過去假設(shè)的條件句。
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