1) my mother ____ arrived late, she must ___ been in a traffic jam a) had/has b) have/had c) has/have 2) she couldn't have ____ the exam because she ____ studied enough a) passes/haven't b) pass/hasn't c) passed/hadn't 3) he could have ___ the essay if he ___ so lazy a) written/wasn't b) writes/hasn't c) writing/is 4) he could've ___ the flight if he ___ woken up earlier a) taking/was b) taken/had c) takes/will

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