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1．Egg prices usually        in the spring when they are most plentiful．（　�。�
A．are droppingB．dropC．have droppedD．will drop

分析 春天當雞蛋供應很充足時，它的價格通常下降．

解答 答案：B  結合選項可知"Egg prices usually        in the spring"陳述的是雞蛋價格通常在春天下降這一事實；句中的副詞"usually：通常"也表明本句要使用一般現(xiàn)在時；"Egg prices"是表示復數(shù)的名詞短語用作主語，所以動詞要用原形．故選B

點評 本題考查的是一般現(xiàn)在時的用法．即一般現(xiàn)在時可以用于表示經常性，習慣性的動作或用于陳述某一事實或客觀真理，句中常用的副詞有often，always，every day/month/year…，usually，sometimes等．

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