don’t cross the road if there ________ traffic、 A、are a lot of B、are many C、is much D、is much too为什么?

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don’tcrosstheroadifthere________traffic、A、arealotofB、aremanyC、ismuchD、ismuchtoo为什么?don’tcrosstheroad

don’t cross the road if there ________ traffic、 A、are a lot of B、are many C、is much D、is much too为什么?
don’t cross the road if there ________ traffic、 A、are a lot of B、are many C、is much D、is much too
为什么?

don’t cross the road if there ________ traffic、 A、are a lot of B、are many C、is much D、is much too为什么?
C
traffic是不可数名词,所以用is