Whatever ______ the difficulties, we must go on with the experiment.
A: were
B: be
C: should be
D: could be
A: were
B: be
C: should be
D: could be
举一反三
- We ______ here at lunch time; we were delayed at the airport, though. A: could be B: should be C: must have been D: would have been
- It's late. It's time＿＿home. A: we go B: we must go C: we should go D: we went
- ___ I be free tomorrow, I could go with you. A: Could B: Should C: Might D: Must
- He went on foot, but he ____ by bus. A: should go B: must have gone C: can go D: could have gone
- We must always go into the whys and wherefores of anything. On no account should we______.