Mr Green was watching TV someone knocked at the door. A. while B. when C. since D. after——青夏教育精英家教网——

题目内容

Mr Green was watching TV ______ someone knocked at the door.

A. while
B. when
C. since
D. after

试题答案

B

相关题目

Mr Green was watching TV ______ someone knocked at the door.

A. while
B. when
C. since
D. after

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