问题标题:
高考英语单选题情态动词Whilebyregulationshighschoolstudents______notusecellphonesintheschool,theycanusepublicphonestokeepintouchwithfriendsandfamily.A.mustB.shallC.wouldD.might请解释下为什么不选A
问题描述:

高考英语单选题情态动词

Whilebyregulationshighschoolstudents______notusecellphonesintheschool,theycanusepublicphonestokeepintouchwithfriendsandfamily.

A.mustB.shallC.wouldD.might

请解释下为什么不选A

龙北生回答:
  shallnot是不应该的意思.
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