Your natural tendency is to concentrate on what is going on ahead of where we are going, so you need to check your mirrors __________.

Question Your natural tendency is to concentrate on what is going on ahead of where we are going, so you need to check your mirrors __________.
A. if visibility is poor
B. before you answer your cell phone
C. unless you are the only car on the road
D. whenever you change speed or position







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whenever you change speed or position