We must do everything we can waste water from running into rivers. A. keep B. kept——青夏教育精英家教网——

摘要： We must do everything we can waste water from running into rivers. A. keep B. kept C. to keep D. keeping

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We must do everything we can _____ waste water from running into rivers.

A. keep
B. kept
C. to keep
D. keeping

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We must do everything we can waste water from running into rivers.

A. keep
B. kept
C. to keep
D. keeping

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We must do everything we can _______ waste water from running into rivers.

[ ]

A. keep
B. kept
C. to keep
D. keeping

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We must do everything we can _________ waste water from running into rivers．

A． keep B． kept C． to keep D． keeping

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We must do everything we can ________ waste water from running into rivers．

keep

kept

to keep

keeping

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