Young Americans prefer racing bikes because it can help _______(keep fit)

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Young Americans prefer racing bikes because it can help _______(keep fit)
Young Americans prefer racing bikes because it can help _______(keep fit)

Young Americans prefer racing bikes because it can help _______(keep fit)
to keep fit
或者原形
解析 help (to) do sth

to keep fit 当主语是物时,help后常加to do 结构。

keep fit