If plants are to grow, they______nitrogen.A、have toB、hadC、havingD、must haveD

游客2024-01-02 27

问题 If plants are to grow, they______nitrogen.

选项 A、have to
B、had
C、having
D、must have

答案 D

解析 In this future real conditional sentence, must have is the correct verb form in the result clause.

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