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下列字母书写格式正确的是 ____。
#16885
A
B
C
D
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Which of the pictures below tells people not to fish here? 
#38803
A
B
C
D
It’s necessary for human beings to breath _______ and plants can produce it.
#17259
A
CO2
B
H2
C
O2
D
N2
 —I want to eat some traditional Chinese food.—You had better go to_______
#16742
A
B
C
D
/d/ 
#17284
A
hoped
B
rained
C
lasted
D
talked
Children are having a good time in the park.
#17289
A
have fun
B
enjoy themselves
C
having fun
D
playing games