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题目内容
（云南工商学院-生活英语听说）
[单选题,10分] Though Mary continued working, she kept looking at the clock ______, thinking of her sick baby in hospital.
A.all the time
B.at once
C.after a while
D.for a moment
A.all the time
B.at once
C.after a while
D.for a moment
参考答案