专四语法真题集
I.独立主格构造
Agriculture is the countrys chief source of wealth，wheat ______ by far the biggest cereal crop.
a. is b. been c. be d. being
2. Time ______，the celebration will be held as scheduled.
a. permit b. permitting c. permitted d. permits
3. There ____ nothing more for discussion，the meeting came to an end half an hour earlier.
a. to be b. to have been c. being d. be
4. _____ no cause for alarm，the old man went back to his bedroom.
a. There was b. Since c. Being d. There being
The coun ...