---- Where is Jack?
----He _________ football on the playground with those AFS students, but I am not sure.
| A．must be playing | B．must have played |
| C．may be playing | D．may have played |
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---- Where is Jack?
----He _________ football on the playground with those AFS students, but I am not sure.
| A．must be playing | B．must have played |
| C．may be playing | D．may have played |
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