B. can' t
C. don' t have to
D. must
(延边F) [考场错解]
D
(延边F) [专家把脉]
根据句意“你没必要付电话费”,r6don’t have to=need not.
(延边F) [对症下药]
C
(延边F)专家会诊
情态动词中三组表达方式的用法区别:1.would与used to的区别。在表示过去重复的习惯时,used to可用would代替。used幻强调过去的行为同现在的对比,含有“过去怎样,而现在却不这样了”的含义;而would则单纯表示过去的习惯动作,常与often, every clay连用,当只是表示过去的状态时,只能用used too如:·
They would have a drink in the bar at noon.
They used to have a drink in the bar at noon.
(现在可能不了)
He used to be a very strong man.
(不能用
would,现在可能不强壮了)
China is not what it used to be.
(表示对比,
不能用would)
Every evening, she would sit in front of the
door to wait for her son.
(表示过去的习惯动作,
不能用USed to)
There used to be a temple on the too of the
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