9．To keep safe，drivers aren't supposed to drink before driving．（　�。�
A．aren't willing toB．shouldn't
C．aren't sure toD．don't have to

分析 為了保持安全，司機(jī)不應(yīng)該在開車前喝酒．

解答 答案：B．
首先明確選項(xiàng)中各個(gè)短語的意思，A：不愿意；B：不應(yīng)該；C：不確定；D：不必； 根據(jù)語境To keep safe，drivers aren't supposed to drink before driving可知句意是"為了保持安全，司機(jī)不應(yīng)該在開車前喝酒"，由此判斷原句中的短語aren't supposed to 相當(dāng)于shouldn't，故選B．

點(diǎn)評 了解每個(gè)選項(xiàng)的含義是做好此類題型的關(guān)鍵，還要從句意著手，根據(jù)句意作出解答；所以，平時(shí)的學(xué)習(xí)中要多進(jìn)行積累詞匯，才能很好的完成．

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