Question

（太原五中2008—2009学年度第二学期月考 （2月）， 25）It is vital that we _____ act out at once to protect the environment.

  A. would           B. should             C. will          D. can

Answer 1

B

解析:

It is vital/important/strange/necessary/natural…that 从句中，从句运用should跟动词原形。