问题补充:
Not until he finished his homework him to watch TV in the evening .
A. his mother allowed
B. his mother had allowed
C. did his mother allow
D. had his mother allowed
答案:
A. his mother allowed
B. his mother had allowed
(答案→)C. did his mother allow
D. had his mother allowed
解析: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。