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

考查副词辨析。Already已经，一般用于肯定句子中间；yet已经，一般用于否定句及疑问句句尾；still 仍然；ever曾经。句意：我听说科学家们已经向火星发射了一艘宇宙飞船。——真的吗？已经到了没有？故选B。