last sunday morning seven students spent two hours_their homework a;did b;do c;doing d;does

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last sunday morning seven students spent two hours_their homework a;did b;do c;doing d;does
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last sunday morning seven students spent two hours_their homework a;did b;do c;doing d;does
last sunday morning seven students spent two hours_their homework a;did b;do c;doing d;does

last sunday morning seven students spent two hours_their homework a;did b;do c;doing d;does
C
spend .doing sth 花费时间做某事

C
spend 时间 doing

您好:
c;doing
spend +时间+doing 表示做某事花了多少时间哦。
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