题目内容
单项选择。
China became a WTO member ____ December 11th 2001.
[ ]
A. on
B. in
C. at
D. of
B. in
C. at
D. of
A
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单项选择
In China, the ________ of deserts is increasing the amount of yellow.
[ ]
|
A ．expanse |
B ．expansion |
C ．expansions |