题文
—Why，I didn’t get you on the phone.
—We ________football on the playground when you phoned.
| A．must be playing |
| B．must play |
| C．must have played |
| D．must have been playing |
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—Why，I didn’t get you on the phone.
—We ________football on the playground when you phoned.
| A．must be playing |
| B．must play |
| C．must have played |
| D．must have been playing |
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