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

B 【解析】句意：Sam的臉上帶著微笑，他一定很確信他的回答是正確的。-我想是這樣的。在我們班沒有人能像他那樣好。certain確定的；uncertain不確定的；good好的，形容詞；well好，副詞。根據(jù)句意There is a smile on Sam's face可知，Sam對答案很確定，故先排除C和D。第二個空是來修飾動詞did的，應(yīng)用副詞，故選B。
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