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第一道题是这样的,Where is Tom,do you know?

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第一道题是这样的,Where is Tom,do you know?
No,but I heard ______ in his room a few minutes ago.
A.him sing B.him singing C.he was singing D.All the answers are right
第二道题是一个介词,They often sell the oranges_____ 3 yuan a kilo.
1.A由情景知道,他刚才正在唱歌,因此用hear sb doing
2.for当出现price这个单词使用at,否则金钱前用fo