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Collecting stamps as a hobby___________ increasingly popular during the past fifty years.

A. becomes         B. became        C. has become     D. had become

Collecting stamps as a hobby___________ increasingly popular during the past fifty years.

A. becomes         B. became        C. has become     D. had become

Collecting stamps as a hobby___________ increasingly popular during the past fifty years.

A. becomes         B. became        C. has become     D. had become

Collecting stamps as a hobby___________ increasingly popular during the past fifty years.

A. becomes         B. became        C. has become     D. had become

Collecting stamps as a hobby___________ increasingly popular during the past fifty years.

A. becomes　　　　 B. became　　　 C. has become　　 D. had become