—Do you know if they ______ to play football with us tomorrow?
—I think they will come if they ______ free.
| A．will come; will be | B．will come; are |
| C．come; are | D．come; will be |
—Do you know if they ______ to play football with us tomorrow?
—I think they will come if they ______ free.
| A．will come; will be | B．will come; are |
| C．come; are | D．come; will be |
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