20．This notice _______ aimed at increasing people's awareness of the problem__________ it has become quite extreme．（　�。�
A．is； beforeB．was； because
C．is； becauseD．has been； before

分析 該公告旨在提高人們對(duì)這個(gè)問(wèn)題的認(rèn)識(shí)，因?yàn)樗呀?jīng)變得相當(dāng)嚴(yán)重了．

解答 答案：C
分析句意可知，第一個(gè)空考查的是固定短語(yǔ)be aimed at"旨在，以…為目的"的用法，根據(jù)"___it has become quite extreme"使用了現(xiàn)在完成時(shí)可知，主句應(yīng)使用一般現(xiàn)在時(shí)用以說(shuō)明現(xiàn)在的情況；故排除B．D；由于前后兩句之間是因果關(guān)系，故第二個(gè)空應(yīng)填連詞because；故選C．

點(diǎn)評(píng) 做本題時(shí)，首先應(yīng)根據(jù)句意識(shí)別出第一個(gè)空考查的是固定短語(yǔ)be aimed at的用法，并根據(jù)句中的已知時(shí)態(tài)確定出主句的時(shí)態(tài)；其次通過(guò)分析句子之間的句意關(guān)系，確定出本句考查的應(yīng)是原因狀語(yǔ)從句的用法，從而選出相應(yīng)的從屬連詞．

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