问题
选择题
—Jack. All the young trees____at once.
—OK. I'll do it at once.[ ]
A. must be watered
B. must water
C. must be watering
答案
答案：A
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—Jack. All the young trees____at once.
—OK. I'll do it at once.[ ]
A. must be watered
B. must water
C. must be watering
答案：A