―When was the house built? ―It was built in 1949 the PRC was founded．A. whichB. thatC. wh

问题补充：

―When was the house built?

―It was built in 1949 the PRC was founded．

A. which

B. that

C. what

D. when

答案：

A. which

B. that

C. what

(答案→)D. when

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