We have to work extra hours to finish our plan, _______ the boss can’t allow us to take a day off tomorrow.
A．soB．orC．andD．but
B

試題分析：考察連詞辨析。A于是；B否則；C并且；D但是；句意：我們不得不加班來完成我們的計劃，否則老板不可能允許我們明天休息的。根據(jù)句意說明B項正確。
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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