1) I’m sure he forgot about our meeting. He __________ about our meeting. a) A) should have forgotten b) B) can’t have forgotten c) C) must have forgotten d) D) might have forgotten 2) It’s impossible that she was at school—she was in the hospital! She __________ at school. a) A) must have been b) B) can’t have been  c) C) might have been d) D) should have been 3) Perhaps they didn’t see the email. They __________ the email. a) A) must have seen b) B) might have missed  c) C) can’t have opened d) D) should have read 4) I regret not studying more. I __________ more. a) A) must have studied b) B) might have studied c) C) should have studied d) D) can’t have studied 5) I have no idea why he didn’t answer. He __________ busy. a) A) must have been b) B) should have been c) C) can’t have been d) D) might have been 6) Rephrase: “I’m sure she didn’t do it.” She __________ it. a) A) must have done b) B) might have done c) C) can’t have done d) D) could have done

Probability in the past

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