单选题
By the time they ______ enough money for a down payment on a house, prices ______considerably.
A、
had saved; rose
B、
saved; were risen
C、
had saved; had risen
D、
had saved; were rising
【正确答案】
C
【答案解析】
[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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