By the time they __ enough money for a down payment on a house, prices _

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问题 By the time they ______ enough money for a down payment on a house, prices ______considerably.

选项 A、had saved; rose
B、saved; were risen
C、had saved; had risen
D、had saved; were rising

答案 C

解析到他们攒够了房子的首付款时，房价已大幅上升。by the time到…时候为止。down payment首付，预付定金。前后都用过去完成时，表示在过去某一时间之前已经发生或完成了的动作或状态。

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By the time they ______ enough money for a down payment on a house, prices _____