1． It is usually warm in my hometown in March, but it ________be rather cold sometimes. (江苏苏州卷)
A．must B．can
C．should D．would
答案：B
解析：
在我的家乡，三月份通常很暖和，但有时或许很冷。当表达一种可能性时通常可以用can be或may be。故选B。
2．—Another cup of coffee？
—No, thanks. I ________be off. Mary is waiting for me. (浙江绍兴卷)
A．can B．may
C．must D．might
答案：C
解析：
——再来一杯咖啡？
——不，谢谢。我必须得走了。Mary在等我。
按照语气的强烈程度,排列顺序应为must，can，may，might。根据句意，因为Mary在等我，所以我“必须”走。故选C。
3．—Who's that girl swimming in the pool？ Is it Lucy？
—It ________be Lucy. She is sleeping in her bedroom now. (山东济南卷)
A．may B．can't
C．must D．should
答案：B
解析：
——在游泳池里游泳的那个女孩是准呀？是露西吗？
——不可能是露西，她现在正在房里睡觉呢。
表肯定推测用must，表示否定推测用can't。
4．—Susan has bought a large house with a swimming pool.
—It ________be very expensive. I never even dream about it. (江西卷)
A．must B．might
C．can't D．shouldn't
答案：A
解析：
——苏珊买了一栋带游泳池的大房子。
——那一定很贵。我做梦都没敢想买那样的房子。
must一定；might可能；can't不可能；shouldn't不应该。
