He looked as if he ­­­_____ the answer.
A．knewB．had knownC．knows D．has known
B
本題考查as if后接從句使用虛擬語氣的用法。如果as if后面的從句表示與過去的事實(shí)相反使用過去完成時(shí);as if后面的從句表示與現(xiàn)在或者將來的事實(shí)相反，句子中用過去時(shí)。本句是與過去事實(shí)相反，所以選擇B。
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