"We have some accidents on this line, but no accidents ______ since last winter."
A: had occurred
B: have occurred
C: occur
D: are occurring
A: had occurred
B: have occurred
C: occur
D: are occurring
举一反三
- "We have some accidents on this line, but no accidents ______ since last winter." A: had occurred occurring B: have occurred C: occur D: are
- 41. "We have some accidents on this line, but no accidents ___B___ since last winter." A: A. had occurred occurring B: B. have occurred C: C. occur D: D. are
- 4. Some of the accidents might have been avoided if we ___ his advice. A: follow B: followed C: have followed D: had followed
- Without these achievements, the opening of the west ____ A: couldn't occur B: needn't have occurred C: couldn't have occurred D: can't occur
- ______, the damage would be incalculable. A: Should such a disaster occur B: If such a disaster had occurred C: Had such a disaster occurred D: If such a disaster should be occurred