It is (believed)that trees can warn (each other) (to) danger by releasing (chemi

游客2023-09-22 26

问题 It is (believed)that trees can warn (each other) (to) danger by releasing (chemicals) into the air.

选项 A、believed
B、each other
C、to
D、chemicals

答案 C

解析把to改为of，warn sb．of sth．是固定搭配。

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