问题
单项选择题
You must explain()how they succeeded()the experiment.
A.of us;for
B.at us;at
C.to us;in
D.for us;to
答案
参考答案:C
You must explain()how they succeeded()the experiment.
A.of us;for
B.at us;at
C.to us;in
D.for us;to
参考答案:C