作业帮(to run/running/run) in winter because it helps them to keep warm
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(to run/running/run) in winter because it helps them to keep warm
(to run/running/run) in winter because it helps them to keep warm
(to run/running/run) in winter because it helps them to keep warm
这是一道选择题吧?答案应该是run,因为这样一来就构成了一个祈使句,不过最好在because前加一个逗号.
to run ,不定式做主语