【题目】Hang a wet towel in your hotel room —— because of climate-controlled rooms and windows that don’t open, the air _________ be very dry.
A. must B. can
C. shall D. need
在线课程【答案】B
【解析】
考查情态动词。A. must必须，一定；B. can可能；能够；有时可能，有时会；C. shall将要；D. need需要；本句表示要在宾馆房间里挂一块湿毛巾，室内的空气有时会可能会很干燥。根据句意可知B项正确。