—Mum,Tomisalwaysworkinglateintonight.Idon'tknowwhatheis...

問題詳情：

—Mum, Tom is always working late into night. I don't know what he is busy doing.:狀_元_源Z_—Oh ,he _____for his new project.

A. has prepared   B. had prepared   C. has been preparing   D. was preparing

【回答】

C

知識點：現在完成進行時及其被動式

題型：選擇題