—Who______ it be that is knocking at the door?
—It ______ be Father, but I’m not sure.
| A．can; must | B．can; may | C．must; can | D．may; must |
相关试题
(绰号).
(绰号).Can you see that building ______ by trees? That’s ______ we study.
| A．surrounded; which | B．surrounding; where |
| C．to be surrounded; in which | D．surrounded; where |
Sir, you ________ take this seat. It’s just for the old.
| A．oughtn’t to | B．can’t | C．won’t | D．needn’t |
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