【B1】 [br] 【B6】A、of itB、/C、of themD、of whichDthe purpose of which is to...其目的

游客2023-07-31  10

问题 【B1】 [br] 【B6】

选项 A、of it
B、/
C、of them
D、of which

答案 D

解析 the purpose of which is to...其目的是……;关系代词which指先行词the use of chemicals and fertilizers。
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