doing morning exercises --------(be) good for our health

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doing morning exercises --------(be) good for our health
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doing morning exercises --------(be) good for our health
doing morning exercises --------(be) good for our health

doing morning exercises --------(be) good for our health
is
doing morning exercies是主语,晨练的意思,是单数.

is

doing morning exercises ---is-----(be) good for our health
做早操有益于我们的健康。
doing morning exercies是主语,做早操,晨练的意思,是单数