—When shall we go planting trees in the hill?— it begins to rain so they don’t need water

问题补充：

—When shall we go planting trees in the hill?

— it begins to rain, so they don’t need watering.

A. Not until

B. While

C. Till

D. Unless

答案：

(答案→)A. Not until

B. While

C. Till

D. Unless

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