【題目】David, get up early, _______ you'll not catch the early bus.

A. but B. and C. after D. Or

【答案】D

【解析】

試題分析：句意：大衛(wèi)，早點(diǎn)起床，否則你將會趕不上早班車了。分析選項，but但是；and和；after之后；or否則。結(jié)合題文，兩句之間的關(guān)系為否則之意，因此選擇第四項。故選 D

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