exercise可以作名词也可以作动词
所以可以填 doesn't do 也可以只填doesn't
His grandpa doesn't exercise in the morning.
他的爷爷早晨不锻炼。
要看要求填写几个单词，再做决定。
DOES HIS GRANDPA DO EXERCISE IN THE MORNING?
可以填 doesn't do
His grandpa doesn't do exercise in the morning.
他的爷爷早晨不锻炼。
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