[单选题]It ________ bothering him in recent days, ever since he began to think of the delay as having an indefinite timescale.
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2023-11-01 15:02:13
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[单选题]It ________ bothering him in recent days, ever since he began to think of the delay as having an indefinite timescale.

A.has been
B.had been
C.have been
D.is
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广东开放大学

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