题目内容
The volunteers are doing _____ difficult and important work; they share ____ common goal to help people in need.
A. a; a B. a; the C. 不填; the D. 不填; a
D
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The volunteers are doing _____ difficult and important work; they share ____ common goal to help people in need.
A. a; a B. a; the C. 不填; the D. 不填; a
D
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