In （）to the government’s call，a great number of doctors and soldiers went to the frontline of fighting against the flood.

（）such a job was sheer good luck.

A.Offering
B.Offered
C.Being offered
D.Being offering

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You （） to attend the conference last week.Where did you go？

A.should have come
B.should come
C.should had come
D.should had been

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