What is going to be when he ________ up?


  1. A.
    is growing
  2. B.
    grows
  3. C.
    will grow
  4. D.
    is going to grow
B
解析：
含有when引导的时间状语从句的复合句，主句用一般将来时，从句用一般现在时表将来，故选B。
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