Sometimes i go to school ______ bus ,sometimes _______ feet.

(A) on, by                (B) by ,by                    (C) on,on                      (D) by , on

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D     ds  eses

The answer is D,right?

am i right?

D is ok. by bus and on foot

on foot or on feet ?

I  am confused .

D
on foot and by bus

I think is B

It's  easy.   The  answer  is  D.  OK?

it is D。