One third of our work--- finished.
A
had
B
has been
C
were
D
have been
Correct Answer: has been
Subject অংশে fraction (ভগ্নাংশ) থাকলে পরবর্তী noun অনুযায়ী verb ব্যবহৃত হয়। এখানে work একটি uncountable noun.