You should do more-------.Do not always sit at the desk busy doing your -----.A exercise; exercisesB exercises; exercisec exercises; exercisesD exercise; exercise

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You should do more-------.Do not always sit at the desk busy doing your -----.A exercise; exercisesB exercises; exercisec exercises; exercisesD exercise; exercise

You should do more-------.Do not always sit at the desk busy doing your -----.A exercise; exercisesB exercises; exercisec exercises; exercisesD exercise; exercise
You should do more-------.
Do not always sit at the desk busy doing your -----.
A exercise; exercises
B exercises; exercise
c exercises; exercises
D exercise; exercise

You should do more-------.Do not always sit at the desk busy doing your -----.A exercise; exercisesB exercises; exercisec exercises; exercisesD exercise; exercise
应该是A ,因为前者是运动的意思,只能用单数,后者是做具体的作业,习题的意思,所以用复数.