— Why do you think ______?
— He could ______ for exercise.
| A．is the man running, run | B．the man is running, be running |
| C．does the man run, run | D．the man runs, be running |
— Why do you think ______?
— He could ______ for exercise.
| A．is the man running, run | B．the man is running, be running |
| C．does the man run, run | D．the man runs, be running |
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