问题描述：
Go on ________ the other exercise after you have finished this one.
Go on ____B____ the other exercise after you have finished this one.
A.to do B.doing C.with D.to be doing
选哪个?
Go on ____B____ the other exercise after you have finished this one.
A.to do B.doing C.with D.to be doing
选哪个?
问题解答：
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