after cleaning the windows,he [ ] the floorA;go on sweepingB;went on sweepC;went on to sweepD;went onsweeping必须有理由

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aftercleaningthewindows,he[]thefloorA;goonsweepingB;wentonsweepC;wentontosweepD;wentonsweeping必须有理由a

after cleaning the windows,he [ ] the floorA;go on sweepingB;went on sweepC;went on to sweepD;went onsweeping必须有理由
after cleaning the windows,he [ ] the floor
A;go on sweeping
B;went on sweep
C;went on to sweep
D;went onsweeping
必须有理由

after cleaning the windows,he [ ] the floorA;go on sweepingB;went on sweepC;went on to sweepD;went onsweeping必须有理由
C;went on to sweep .
go no to do something表示继续做另一件事(不同于前一件事)
go no doing something表示接着继续做某件事(和前一件事相同)

C
to do 是继续做不同的事
doing是做相同的事

B;went on sweep
go on 是继续的意思,既然知道after cleaning the windows,he [ ] the floor,那就是过去的动作.所以...

选d go on doing sth

c