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(shí)態(tài)及主謂倒裝，句意：只有當(dāng)開(kāi)始上課時(shí)，他才意識(shí)到他把書(shū)丟在了家里。結(jié)合語(yǔ)境可知本句描述的是過(guò)去發(fā)生的動(dòng)作，故用過(guò)去時(shí)態(tài)。當(dāng)only位于句首時(shí)，主句用部分倒裝，助動(dòng)詞提前。故選C。
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