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
考查倒装句与时态。句意：晚上，直到他完成了作业，他的母亲才允许他看电视。根据条件从句时态，可知主句描述的是过去发生的动作，故用过去时态。当not until位于句首时，主语用部分倒装，助动词提前，故选C。