Mike is helping David _the floor.这道题填sweeping吗?Nancy ——in London now.这道题填is live?

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Mike is helping David _the floor.这道题填sweeping吗?Nancy ——in London now.这道题填is live?

Mike is helping David _the floor.这道题填sweeping吗?Nancy ——in London now.这道题填is live?
Mike is helping David _the floor.这道题填sweeping吗?Nancy ——in London now.这道题填is live?

Mike is helping David _the floor.这道题填sweeping吗?Nancy ——in London now.这道题填is live?
sweep (help后碰到动词,要用动词不定式)
lives(live一般无进行时)
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