If you         be there before 10, you have to say goodbye to each other and set off now.


  1. A.
    are to
  2. B.
    are about to
  3. C.
    will
  4. D.
    will be going to
A
解析：
if引導(dǎo)的條件狀語從句中不能用將來時(shí)態(tài)表將來，be to相當(dāng)于must, have to 所以選A。
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