题文
—Who ______ it be that hasn't handed in his homework?
—It ______ be Bob. He handed it in yesterday.
| A．can; mustn't | B．must; can |
| C．can; can't | D．may; must |
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—Who ______ it be that hasn't handed in his homework?
—It ______ be Bob. He handed it in yesterday.
| A．can; mustn't | B．must; can |
| C．can; can't | D．may; must |
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