问题
选择题
The project requires more labor than _____ because it is extremely difficult.[ ]
a. has been put in
b. have been put in
c. being put in
d. to be put in
答案
a
搜题请搜索小程序“爱下问搜题”
The project requires more labor than _____ because it is extremely difficult.[ ]
a. has been put in
b. have been put in
c. being put in
d. to be put in
a