问题标题：
OneFriday，wewerepackingtoleaveforaweekendaway______mydaughterheardcriesforhelp．（）A.afterB.whileC.sinceD.when
问题描述：
One Friday，we were packing to leave for a weekend away ______my daughter heard cries for help．（）
A.after
B.while
C.since
D.when
郭常忠回答：
答案D．after在…之后；while当…时；since因为；when在…时．“bedoingsth…when…，正在做某事的时候，这时突然…”为固定句型，所以答案选D．
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