Workers should keep in mind that _______using this material carelessly may result in serious accidents since it is lethal.

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问题 Workers should keep in mind that _______using this material carelessly may result in serious accidents since it is lethal.

选项 A、they
B、their
C、them
D、themselves

答案B

解析动名词using是that从句的主语。这里考查的是动名词做主语。应当使用所有格。动名词本来是从动词出发，所以可能做主语，也可能根据形式的不同而需要宾语或表语。

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