问题
选择题
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
答案
答案：A
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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