they failed many times,but they (c )to work hard.

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theyfailedmanytimes,butthey(c)toworkhard.theyfailedmanytimes,butthey(c)toworkhard.theyfailedmanytime

they failed many times,but they (c )to work hard.
they failed many times,but they (c )to work hard.

they failed many times,but they (c )to work hard.
they failed many times,but they (continued )to work hard.

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Continued为正确答案,从failed可知为过去式

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