He was busing writing a story,only___once ina while to smoke a cigarette.A.to stop B.stopping C.to have stopped D.haing stopped谁能解析一下?

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He was busing writing a story,only___once ina while to smoke a cigarette.A.to stop B.stopping C.to have stopped D.haing stopped谁能解析一下?
He was busing writing a story,only___once ina while to smoke a cigarette.
A.to stop
B.stopping
C.to have stopped
D.haing stopped
谁能解析一下?

He was busing writing a story,only___once ina while to smoke a cigarette.A.to stop B.stopping C.to have stopped D.haing stopped谁能解析一下?
是B吧
因为要考虑到parallel structure,前面用writing,后面也要跟ing,所以是stopping