题目内容
【题目】_________ we do, we must be _________.
A.However, careful
B.Whatever, careful
C.However, carefully
D.Whatever, carefully
【答案】B
【解析】根据题干和选项提示可推知句意为：不管你做什么，我们必须小心。Do后缺少宾语，所以前面的引导词要用whatever，指代宾语；however指代状语。must be+形容词；careful是形容词，carefully是副词。所以答案是：B
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