题文
—Shall we go for a picnic in the forest park tomorrow？
—Yes，________it rains heavily．
| A．if |
| B．unless |
| C．until |
| D．when |
—Shall we go for a picnic in the forest park tomorrow？
—Yes，________it rains heavily．
| A．if |
| B．unless |
| C．until |
| D．when |
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