12. Little Jonny is only two months old, so his parents has to keep an eye ______ him all the time.(

問題詳情

12. Little Jonny is only two months old, so his parents has to keep an eye ______ him all the time.
(A) in
(B) of
(C) at
(D) on

參考答案

答案：B
難度：計算中-1
書單：沒有書單，新增

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上一篇 : 11. To say is one thing: to do is ______. They are quite different.(A) the other (B) the others (C)
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