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______ the prices of color TV sets down by 50%, the company had a very hard time.
A．AsB．WithC．Because ofD．For
B
連詞辨析。As和with都表示隨著，as是連接詞，后面要加句子。而with是介詞，后面加名詞短語。Because of和For都表示原因，because of 用于表示引起事情發(fā)生的直接原因。for 除了能表示“由于”這一含義外，還常常用于表示心理原因。句意：隨著彩色電視價格降了50%，這家公司度過了一段非常艱難的時刻。the prices of color TV為名詞性短語，故選B。
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