--It is really fun to hike and I often go hiking in the forest.
--But hiking alone in the forest be very dangerous.
A. can
B. must
C. shall
D. will
网友回答
(答案→)A. can
B. must
C. shall
D. will
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。