Furniture makers use glue to hold joints together and sometimes to reinforce it.

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问题 Furniture makers use glue to hold joints together and sometimes to reinforce it.

选项 A、its
B、fast
C、hard
D、them

答案D

解析 所填之词应指前面提到的joints,是名词复数,所以应用代词them来代替。因此答案为D。
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