Ruth _______ received my letter; otherwise she would have replied by now.
A: must have
B: should have
C: couldn't have
D: ought to have
A: must have
B: should have
C: couldn't have
D: ought to have
举一反三
- Mary ____________my letter, otherwise she would have replied before now.
- She _____me and then I could have helped her. A: must have told B: didn’t have to tell C: would have told D: ought to have told
- —They haven't finished the work up to now. —Well, they ______. A: should B: should have C: would D: must have
- "Where is the key to my bike? I _____ it." A: must have lost B: should have lost C: will have lost D: ought to have lost
- •My wallet is nowhere to be found. I _________ in the store. A: must drop it B: must have dropped it C: should have dropped it D: ought to have dropped it