—Nowadays a growing number of people go to work by bike.
—Bicycling is good exercise；________it doesn't pollute the air.
| A．therefore | B．moreover | C．however | D．otherwise |
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—Nowadays a growing number of people go to work by bike.
—Bicycling is good exercise；________it doesn't pollute the air.
| A．therefore | B．moreover | C．however | D．otherwise |
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