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You look so tired. You _________ have stayed up again.

       A. should                                         B. can                                   C. may                                  D. must

You look so tired. You _________ have stayed up again.

       A. should                                   B. can                          C. may                         D. must

You look so tired. You______have stayed up late again.

       A．should      B．can    C．may         D．must

You look so tired. You______have stayed up late again.

       A．should      B．can    C．may         D．must

You look so tired. You________have stayed up late again.

       A．should      B．can    C．may         D．must