There （) more than 300,000 kinds of plants on the earth.A.isB.are existingC.existsD.

There () more than 300,000 kinds of plants on the earth.

A.is

B.are existing

C.exists

D.exist

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There ( ) more than 300 000 kinds of plants on the earth.A.isB.are existingC.existsD.

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