—Wow, Sally has never missed a day of work before.—Well, ...

★ Modals with Perfect Infinitive

—Wow, Sally has never missed a day of work before.—Well, she was coughing yesterday, and she didn’t look good. She ___ gotten sick.

A. should have

B. might

C. must have

D. can’t have

Preview next quiz:

I ___ at the door since, in this way, I awoke the baby.

A. needn’t have knocked

B. can’t have knocked

C. mustn’t have knocked

D. should have knocked