has finished the task ahead of time will be rewarded though we don’t know who it will b

问题补充：

has finished the task ahead of time will be rewarded, though we don’t know who it will be.

A. Those who

B. Anyone

C. Whoever

D. Who

答案：

A. Those who

B. Anyone

C. Whoever

D. Who

解析：whoever相当于anybody who,A项主谓不一致。