单项选择题

Let's learn to use the problem we are facing（）a stepping-stone to future success.

A. to
B. for
C. as
D. by

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单项选择题
Experts think that（）recently discovered painting may be（）Picasso.

A.the；不填
B.a；the
C.a；不填
D.the；a
单项选择题
—I'm sorry I didn't make it to your party last night. —（）. I know you're busy these days.

A. Of course
B. No kidding
C. That's all right
D. Don't mention it
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