Though Mary continued working, she kept looking at the clock ______, thinking of her sick baby in hospital.<br>A.all the time<br>B.at once<br>C.after a while<br>D.for a moment

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

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