Are you still busy?-yes ,i __my work ,and it won't take long为什么选这个答案

a just finish

b am just finishing

c have just finished

d am just going to finish

为什么不选D,有什么区别

答案是：b. am just finishing 。点动词的进行时表示即将发生的动作。

be going to do 主要有两个意思：一是主语打算...；二是说话人根据当时的情况推测主语即将...