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There is a smile on Sam’ s face. He must be ______ that his answer is right. —I think so. No one did...
题目内容：
There is a smile on Sam’ s face. He must be ______ that his answer is right.
—I think so. No one did as _______as him in our class.
A. certain; good B. certain; well C. uncertain; good D. uncertain; well
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