M:Didn't the comity say it would only take a month for them to complete the report? It took at least twice that long.
W:Yeah, there must with way off the mark.
What does the man mean?
(C)The committee took longer to finish the report than expected.
答案是c,請問一下這整編對話是什麼意思,為什麼會是答案c的意思呢?