--- Do you know Uncle Tom is crazy about gardening?
---Sure. He ____ his flowers in the garden now.
A．may be wateringB．must be wateringC．could look afterD．ought to watch
B
考情態(tài)動詞表示猜測的用法。在表示十分肯定的猜測時，要用must。從對話來判斷，此刻Uncle Tom一定正在花園里種花呢。選項A是干擾項，要注意may在表示猜測時，僅能表示不是十分有把握的猜測。
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