My bicycle is broken now. I ___ ridden it down ...

★ Modals in The Past

My bicycle is broken now. I ___ ridden it down the stairs.

A. musn’t have

B. might have

C. shouldn’t have

D. can’t have

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I called his apartment and nobody answered. He ___ gone out.

A. must have

B. could have

C. can’t have

D. might have