Only when class began ______that he had left his book at home．
A．will he realizeB．he did realizeC．did he realize D．had he realized
C
考查時態(tài)及主謂倒裝，句意：只有當(dāng)開始上課時，他才意識到他把書丟在了家里。結(jié)合語境可知本句描述的是過去發(fā)生的動作，故用過去時態(tài)。當(dāng)only位于句首時，主句用部分倒裝，助動詞提前。故選C。
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