问题
选择题
I don’t have a partner to practice English___ on the weekend.[ ]
A. to
B. with
C. and
D. for
答案
答案：B
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I don’t have a partner to practice English___ on the weekend.[ ]
A. to
B. with
C. and
D. for
答案：B
，此时I中X、Y、Z的物质的量之比为1:3:2。下列判断正确的是