1.They ( )work very when they were young.a.had to b.must c.should d.have to2.today,we( )work as hard as people did in the past.a.mustn't b.can't c.shouldn't d.don't have to3.Yesterday I met my old friend L forgot( )him for his telephone number.a.asking b.ask c.and ask d.to ask选什么?为什么?
问题描述：
1.They ( )work very when they were young.
a.had to b.must c.should d.have to
2.today,we( )work as hard as people did in the past.
a.mustn't b.can't c.shouldn't d.don't have to
3.Yesterday I met my old friend L forgot( )him for his telephone number.
a.asking b.ask c.and ask d.to ask
选什么?为什么?
答
1.选a.had to
根据后半句时态得知是一般过去时，所以选a。
句意：当他们年轻的时候他们不得不努力工作。
2.选d.don't have to
句意：现在，我们没有必要像过去的人那样努力工作了。
A.禁止 B.不能 C.不应该 D.不必要
3.选a.asking
forget doing 忘记做过某事 ；forget to do 忘记要做某事
句意：昨天我遇见我的老朋友我忘记问他电话号码了。
显然昨天是过去时，所以用forget doing
答
1c他们应该在年轻的时候多做些工作，根据语义
2d现在我们不必像过去的人那样做那么多工作
3d忘记做某事
答
a.had to
d.don't have to
a.asking