--- 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
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B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。