--Who has opened the door? ---I think it __ be Lin Tao. He’s always the first to get here.
A.is able to | B.can't | C.must | D.mustn’t |
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--Who has opened the door? ---I think it __ be Lin Tao. He’s always the first to get here.
A.is able to | B.can't | C.must | D.mustn’t |