问题
选择题
They often help the old woman _____ her housework. [ ]
A. in
B. with
C. at
D. on
答案
答案：B
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They often help the old woman _____ her housework. [ ]
A. in
B. with
C. at
D. on
答案：B
不同施工方法在各自然状态下的获利情况（单位：万元）