--- Do you hear someone _____ on the door? --- Yes. It is late at night. Who can _____ be?
| A．knock; he | B．knock; it |
| C．knocking; he | D．knocking; it |
--- Do you hear someone _____ on the door? --- Yes. It is late at night. Who can _____ be?
| A．knock; he | B．knock; it |
| C．knocking; he | D．knocking; it |
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