Henry had just given himself for lost ______ he was spotted by a ship.
A．whenB．whileC．a(chǎn)sD．a(chǎn)fter
A

試題分析：考查連詞辨析。When當(dāng)…時（謂語動詞可以是延續(xù)性也可以是短暫性）；while當(dāng)…時（謂語動詞是延續(xù)性動詞）；as隨著；after在…后；句意：當(dāng)他被一艘輪船發(fā)現(xiàn)的時候，他正要放棄。本句中的動詞spot是一個短暫性動詞，故使用when。
點評：連詞的詞義辨析要放在上下文的語境中進行，要注意上下文的語義的串聯(lián)以及邏輯關(guān)系的推理，特別要注意一些連詞和時間狀語的固定搭配。
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