You ________ knock at the door. Just come in. [ ]A. don't have toB. can't C. mustn'tD

题目简介

You ________ knock at the door. Just come in. [ ]A. don't have toB. can't C. mustn'tD

题目详情

You ________ knock at the door. Just come in.  
[     ]
A. don't have to        
B. can't  
C. mustn't            
D. couldn't
题型:单选题难度:中档来源:同步题

答案

A

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