Question

Not until he finished his homework          him to watch TV in the evening

1. A.
   his mother allowed
2. B.
   his mother had allowed
3. C.
   did his mother allow
4. D.
   had his mother allowed

Answer 1

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。