Whileflying,abat(蝙蝠)makesasound

发布时间：2020-07-28 06:27:51

While flying, a bat(蝙蝠)makes a sound which hits things and es back to its ears．In this way it’s able to know ________ the things are and avoid bumping into them．A.howB.whereC.whatD.which

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B
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