(It) is often easier (to select) a particular tool (than to use) (them) correctly.

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问题 (It) is often easier (to select) a particular tool (than to use) (them) correctly.

选项 A、It
B、to select
C、than to use
D、them

答案D

解析 them代替tool显然不正确。改“them”为“it”。
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