.--- Do you know Uncle Tom is crazy about gardening?
---Sure. He his flowers in the garden now.
A. may be watering
B. must be watering
C. could look after
D. ought to watch
网友回答
A. may be watering
B. must be watering
C. could look after
D. ought to watch
解析：考情态动词表示猜测的用法。在表示十分肯定的猜测时，要用must。从对话来判断，此刻Uncle Tom一定正在花园里种花呢。选项A是干扰项，要注意may在表示猜测时，仅能表示不是十分有把握的猜测。