--It is really fun to hike and I often go hiking in the forest.--But hiking alone in the forest ______ be very dangerous.A.canB.mustC.shallD.will
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A解析考查情态动词。句意是：独自在森林里远足可很危险。can可用以描述特有的行为或情形。答句的语意是向对方提醒注意。又如：It can be quite windy on the hills.山上的风就是那么大。