By the time my parents reached home yesterday, I _____ the dinner already.
A．had cookedB．cookedC．have cookedD．was cooked
A
在英文中有by the time構(gòu)成的時(shí)間狀語(yǔ)從句，主句通常用過(guò)去完成時(shí)，結(jié)構(gòu)為had+過(guò)去分詞，故本題選A。
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