In doing experiments, you must be ______ the precision instruments.

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问题 In doing experiments, you must be ______ the precision instruments.

选项 A、more than careful with
B、more careful than with
C、careful more than with
D、with more careful than

答案A

解析 more than后接形容词,表示被修饰的形容词的强烈程度,是常见的加强语气的结构,意为“非常,十分;岂止”。本题还考查了另一短语be careful with,因此答案是A。
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