單項選擇。—Who'ssinginginthegarden?—It

問題詳情：

單項選擇。

—Who's singing in the garden?

—It ________ be Mr. Brown. He always practices singing at this time.

A. must     B. can't       C. need        D. mustn't

【回答】

A

知識點：情態動詞

題型：選擇題