Mike had just finished his lunch and was about to take a break an unexpected visitor came

发布时间：2020-08-16 16:31:21

Mike had just finished his lunch and was about to take a break      an unexpected visitor came.
A. when
B. while
C. so
D. for

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(答案→)A. when
B. while
C. so
D. for
解析：考查连词。be about to … when …正要做……突然……句意：Mike刚吃完午饭正要休息的时候，突然一名不速之客来临，选A。
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