单项选择题

You must explain to us how they succeeded（）the experiment.

A、for
B、at
C、in
D、to

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单项选择题
It’s a fine day. Why not go to the zoo（）

A. A good idea.
B. No problem.
C. My pleasure.
D. Of course not.
单项选择题
Their new house is（）. It’s very large and bright.

A. delighting
B. delighted
C. lighting
D. lighted
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