Question

---I’ve heard some scientists have sent a spacecraft to Mars.
---Really? Has it arrived _____?
A already     B yet        C still            D ever

Answer 1

B

考查副詞辨析。Already已經(jīng)，一般用于肯定句子中間；yet已經(jīng)，一般用于否定句及疑問句句尾；still 仍然；ever曾經(jīng)。句意：我聽說科學(xué)家們已經(jīng)向火星發(fā)射了一艘宇宙飛船。——真的嗎？已經(jīng)到了沒有？故選B。