当锻炼时不可数,当指做练习（册）是要用复数.
关于do morning exercise
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do morning exercise_
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exercise什么时候加sdo morning exercise还是do morning exercises
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____do you do morning exercise Every morning.A
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—________do you do morning exercises?
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Sam is doing his morning exercises.（用morning exercises提问）
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晨练 do Morning exercises
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do morning exercises everyday改错
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