the maths problem isn't very easy and it is difficult
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the maths problem isn't very easy and it is difficult
a to finish
b to finish it
a to finish
b to finish it
![the maths problem isn't very easy and it is difficult](/uploads/image/z/2478346-34-6.jpg?t=the+maths+problem+isn%27t+very+easy+and+it+is+difficult)
a.
因为后面那句话是 it is difficult 已经有了主词 (it)
因为后面那句话是 it is difficult 已经有了主词 (it)
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