—I think trees ____________ twice a week in such hot weather.
—Yes, I agree. Or they may die without water.
| A．must water. | B．are watered. |
| C．must be planted. | D．must be watered. |
—I think trees ____________ twice a week in such hot weather.
—Yes, I agree. Or they may die without water.
| A．must water. | B．are watered. |
| C．must be planted. | D．must be watered. |
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