Mr Green was watching TV ______ someone knocked at the door. [ ]A. while B. when C. since D. after -

题目简介

Mr Green was watching TV ______ someone knocked at the door. [ ]A. while B. when C. since D. after -

题目详情

Mr Green was watching TV ______ someone knocked at the door.
[     ]
A. while
B. when
C. since
D. after
题型:单选题难度:中档来源:期中题

答案

B

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