题干
－How was Nadal’s cooking?
－Oh, _______. I was quite impressed.
－Oh, _______. I was quite impressed.
A：that’s OK
B：all right
C：pretty good
D：just so-so
答案(点此获取答案解析）
C
小时完成，乙单独做 
小时完成，则两人一起完成这项工程需要