---I’ve heard some scientists have sent a spacecraft to Mars.
---Really? Has it arrived _____?
A already     B yet        C still            D ever
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：我聽說科學家們已經(jīng)向火星發(fā)射了一艘宇宙飛船�！娴膯�？已經(jīng)到了沒有？故選B。
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