—Who’s singing in the garden?
—It ________ be Tom. He always practices singing at this time.
| A．can’t | B．need |
| C．must | D．mustn’t |
—Who’s singing in the garden?
—It ________ be Tom. He always practices singing at this time.
| A．can’t | B．need |
| C．must | D．mustn’t |
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