第二部分英语知识运用（共两节，满分45分）
第一节单项填空（共15小题；每小题1分，满分15分）
从A、B、C、D四个选项中，选出可以填人空白处的最佳选项，并在答题卡上将该项涂黑。
21．－Excuse me, is the shop open around the clock?
－ ．Only from 8:00 a． m． to 4:00 p．m．
A．I'm not sure B．Well, it depends C．That's right D．I'm afraid not
22．Helen looked at finished report with satisfaction.
A．a；不填 B．the;不填 C．a；the D．the; an
23．Somebody has to take responsibility for the problems the company ．in the past few months
A．experienced B．was experiencing
C．has been experiencing D．had been experiencing
24．The famous pop singer was going out ．he found himself surrounded by lots of young people
A．when B．before C． while D．after
