22. As a sales representative, Peter has been demonstrating the new product _____ 10 o’clock this mo

問題詳情

22. As a sales representative, Peter has been demonstrating the new product _____ 10 o’clock this morning.
(A) at
(B) since
(C) for
(D) when

參考答案

答案：B
難度：困難0.394
書單：沒有書單，新增

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