题文
—Listen!Someone is knocking at the door．Who can it be?
—It________be Tom．He said he would visit me this evening．
| A．can’t |
| B．need |
| C．must |
| D．mustn’t |
—Listen!Someone is knocking at the door．Who can it be?
—It________be Tom．He said he would visit me this evening．
| A．can’t |
| B．need |
| C．must |
| D．mustn’t |
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