Question 20: Michael got surprisingly high grades in the final exam. He ……….. his lessons very carefully.

Knowledge: Modal verbs

Explain:

A. can’t have revised: could not have reviewed

B. should have revised: should have revised

C. needn’t have revised: should not need revision

D. must have revised: must have reviewed Use “must have done” to express speculation that something happened in the past.

Michael got a surprisingly high score in the final exam. He must have studied very carefully