Question

One evening when it was swarm, I stayed awake ___________ until half past eleven in order to have a good look at the moon by myself.

A．on average

B．on purpose

C．on sale

D．on schedule

Answer 1

B

試題分析：on average通常，平均；on purpose有目的地；on sale廉價出售；on schedule按時。句意：一天晚上我一直故意沒有去睡覺，直到晚上11:30，為了自己去看看月亮。根據句意故選B。
點評：本題難度適中。介詞短語也是高考的熱點，需要考生平時多積累，注意它們的用法及區別。
即學即練：He could have finished it __________, but somehow he fell behind.
A. on average        B. on purpose        C. on sale         D. on schedule
解析：D。句意：他原本能按預定進度做完這件事的，但不知怎地卻落后了。