I'm not sure but our neighbours ___ some noises when our car ...

★ Modals with Perfect Infinitive

I’m not sure but our neighbours ___ some noises when our car was stolen.

A. should have heard

B. can’t have heard

C. must have heard

D. might have heard

Preview next quiz:

A: I phoned you at nine this morning but got no answer. B: I’m sorry. I ___ been in the garden.

A. should have

B. must have

C. can have

D. could