单项选择题
Only we respect the law of nature can we realize the harmonious coexistence between humans and nature.
A.对
B.错
Only we respect the law of nature can we realize the harmonious coexistence between humans and nature.
A.对
B.错
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单项选择题
When and why he came here ________ yet.
When and why he came here ________ yet.
A.is not known
B.are not known
C.has not known
D.have not known