问
It is vital that enough money ____ to fund the project.
A. be collected B. must be collected
C. is collected D. can be collected(全国四级,97.1-45)
答案为A。为什么不能选C呢？
答
见 essential。
It is vital that enough money ____ to fund the project.
A. be collected B. must be collected
C. is collected D. can be collected(全国四级,97.1-45)
答案为A。为什么不能选C呢？
见 essential。