Not until he finished his homework          him to watch TV in the evening .
A．his mother allowedB．his mother had allowed
C．did his mother allowD．had his mother allowed
C
考查倒裝句與時(shí)態(tài)。句意：晚上，直到他完成了作業(yè)，他的母親才允許他看電視。根據(jù)條件從句時(shí)態(tài)，可知主句描述的是過去發(fā)生的動(dòng)作，故用過去時(shí)態(tài)。當(dāng)not until位于句首時(shí)，主語用部分倒裝，助動(dòng)詞提前，故選C。
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