Though Mary continued working, she kept looking at the clock ______, thinking of her sick baby in hospital.

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问题 Though Mary continued working, she kept looking at the clock ______, thinking of her sick baby in hospital.

选项 A、all the time
B、at once
C、after a while
D、for a moment

答案A

解析 考查固定搭配和句意逻辑。由于空格前的keep doing sth. 强调的是一直不停地做某事,所以空格处应填入与之在意义逻辑上相呼应的固定搭配。all the time指“始终,一直”,符合要求。其余三项中,at once指“立刻,马上”;after a while指“过了不久,过了一会儿”;for a moment指“一会儿,片刻”。
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