What ___important work!I am proud it is ___useful job.A.an a B./ a C.a an D./ an

题目

What ___important work!I am proud it is ___useful job.A.an a B./ a C.a an D./ an
为什么C 不对呢阿.

答案

选择B,因为work不可数,job可数