At first the institute refused to purchase the telescope but this decision was revised.A

问题补充：

At first the institute refused to purchase the telescope, but this decision was revised.

A. occasionally

B. consequently

C. successively

D. subsequently.

答案：

A. occasionally

B. consequently

C. successively

(答案→)D. subsequently.

解析：subsequently(=afterwards)随后，其后。