It_____________ be warm enough indoors in Northeast China, for f

It_____________ be warm enough indoors in Northeast China, for fur-lined slippers don't sel1 well there.
A、 must
B、 will
C、 need
D、 shall
【正确答案】：A
【题目解析】：该题考查的是情态助动词的用法。此句意思是中国东北室内应该很暖和，因为这儿不卖毛拖鞋。句中需要表示推测的情态助动词，只有must表推测。