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答案解析:
1.答案: has tripled that of last year//has increased by times compared with last year
详解:
考查倍数: “增加了三倍”译has tripled或has increased by three times.
考查短语: so far意为“迄今为止",通常跟现在完成时连用。
2. 答案: Suddenly came up with a good idea.
详解:
考查时态: 句首分句用了过去完成进行时，表示在过去某个时间之前一直在进行的动作或反复的动作。后一分句用一般过去时，强调过去某个时候发生的动作。
考查短语: "想出" 可译为come up with.
