Which is more difficult ,() import business or export business?A do B doing

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Whichismoredifficult,()importbusinessorexportbusiness?AdoBdoingWhichismoredifficult,()importbusiness

Which is more difficult ,() import business or export business?A do B doing
Which is more difficult ,() import business or export business?A do B doing

Which is more difficult ,() import business or export business?A do B doing
B 这是一个省略句,doing 动名词来做主语.如seeing is believing

B

B.doing

B

应该是选择doing

B