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