—Another cup of coffee?
—No, thanks. I ________ be off. My friend is waiting for me at the school gate.
| A．can | B．may |
| C．must | D．might |
—Another cup of coffee?
—No, thanks. I ________ be off. My friend is waiting for me at the school gate.
| A．can | B．may |
| C．must | D．might |
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