问题
选择题
More and more kids become unhappy ______ they have too many activities to do. [ ]
A. but
B. or
C. because
D. so
答案
答案：C
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More and more kids become unhappy ______ they have too many activities to do. [ ]
A. but
B. or
C. because
D. so
答案：C
Cu+H2O，在该反应中[ ]