题一：i didn't hear the phone. i _________ asleep.
a. must be b. must have been c. should have been d. could have been
题二：jack described his father, who _______a brave boy many years ago, as a strong–willed man.
a. would be b. would have been c. must be d. must have been
题三：—we didn't see him at the lecture yesterday.
—he _________ it.
a. mustn't attend b. can't have attended
c. would have not attended d. needed have attended
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