wonder if this is the computer you want to have repairedi wonder if this is the computer you want to __________A .have repaired B.have it repaired为什么选A.it为什么不能加?

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wonder if this is the computer you want to have repaired
i wonder if this is the computer you want to __________
A .have repaired B.have it repaired
为什么选A.it为什么不能加?

前面已有this代指computer 所以后面不用加it