The PLA soldiers came to the ruins of Yushu and after seemed to be a long time they help

问题补充：

The PLA soldiers came to the ruins of Yushu and after seemed to be a long time, they helped some victims out.

A. which

B. that

C. what

D. when

答案：

A. which

B. that

(答案→)C. what

D. when

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