—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
The system has been designed to give students quick and easy_____to the digital resources of the library.
| A．access | B．passage | C．way | D．approach |
I’m trying to break the _______ of getting up too late.
| A．tradition | B．convenience | C．habit | D．leisure |
China has got a good _____for fighting against the flu with its careful and smooth organization．
| A．reputation | B．influence | C．impression | D．knowledge |
Hiking by oneself can be fun and good for health. It may also be good for ______ building.
| A．respect | B．friendship | C．reputation | D．character |
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