English and computer______two useful tools in preparing for one’s career, we should do our best to have a good command of them.

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问题 English and computer______two useful tools in preparing for one’s career, we should do our best to have a good command of them.

选项 A、having been
B、were
C、are
D、being

答案D

解析 本题考分词的独立结构作状语的用法。A项是现在分词的完成式,应排除。本句大意为:英语和计算机在职业准备中是两门重要的工具,所以我们必须尽力掌握它们。
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