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—I cannot find Tom anywhere.
He _________ have been off long. I heard him make a call just now.
（4.0分）0.0 分
A、
shouldn.t
B、
can.t
C、
mustn.t
D、
needn.t
He _________ have been off long. I heard him make a call just now.
（4.0分）0.0 分
A、
shouldn.t
B、
can.t
C、
mustn.t
D、
needn.t
参考答案