單項選擇：—Howdidyoufinishtheworksoquickly?—Thecomputerhelpe...

問題詳情：

單項選擇：

— How did you finish the work so quickly?

—The computer helped me. It’s really _______ useful machine.

A. a                      B. an                     C. the                    D. one

【回答】

A

知識點：冠詞

題型：選擇題