选 A
前面 be careful about 小心.
后面 be crucial to 对某人很重要.
careful 应该没问题
to prep.向,往,给...,于...,直到...为止,在...之前,比,对,[表示程度、范围] 到,达
不用 for .
要有解析的谢谢o(∩_∩)o Be（ ）about the documents.It's crucial（ ）your
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