二、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,选出可以填入空白处的最佳选项。
21.with so many things ,they have to work day and night.
a.to be done b.done
c.to do d.doing
22.first impressions are the most lasting.after all,you never get second chance to make first impression.
a.a;the b.the;the c.a;a d.the;a
23.i would appreciate if you could help me.
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