Question

The policeman asked the child ________ cross the street ________ the traffic lights turned green.

A．not, when	B．not to, until
C．didn't, before	D．not to, after

Answer 1

B

试题分析：句意：警察让这个小孩等到交通灯变绿才可以过马路。Ask sb to do sth“让某人做某事”，否定形式：ask sb not to do sth。Not…until“直到……时候才”，结合语境，故选B。