单项选择题

Tom tried his best to keep awake, but the performance was so boring that he couldn't help to sleep.

A．dropping off
B．dropping down
C．dropping away
D．dropping out
<上一题 目录 下一题>
热门 试题

单项选择题
A．atB．onC．forD．by
A．at
B．on
C．for
D．by
单项选择题
Soon after the drug ______ effect, the patient became quieter.
A．brought
B．made
C．took
D．released
相关试题