it's more () to climb that mountain.We must be careful.A,easier B,busier C,most busy D,busiest

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it's more () to climb that mountain.We must be careful.A,easier B,busier C,most busy D,busiest

B more后面应该加比较级,所以CD排除,后面说We must be careful,所以不可能是更容易即A排除,所以是B