Choose the letter A, B, C or D to complete...

Câu hỏi: Choose the letter A, B, C or D to complete the passage below. Check out these wild wedding traditions from around the globe.

Daur Chick Liver Tradition: Inner Mongolia, China

Time to get mystical. To select a wedding date, the young couple must take a knife and together slaughter a chick. The date is then divined by the appearance of the chick's liver. If the liver has an unfortunate appearance, they must keep __________ (11) chicks until they find a good one.
Question 11:

A. killing

B. kill

C. killed

D. to kill