Everyone should play a part in ___ (save) the earth.

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Everyone should play a part in ___ (save) the earth.
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Everyone should play a part in ___ (save) the earth.
Everyone should play a part in ___ (save) the earth.

Everyone should play a part in ___ (save) the earth.
saving
in是介词,后面跟动名词

saving 。in是介词,介词后跟ing

填saving
play a part in doing固定用法