Summative Practice Units 1-4 3 Choose the correct forms. 1 How many books have you borrowed / have you been borrowing from the library this year? 2 How long have you been reading / have you read this novel? 3 Imet/ was meeting him when I was working/ worked abroad. 4 When I got / had got home, I discovered I had lost / lost my keys. 5 By the time he was thirty, he had already become / already became the manager of the company. 6 The teacher asked the students to finish to write / writing. 7 I can't find my glasses. I might have left / might leave them in the library. 8 We used to be / would be friends, but we quarrelled two years ago. I haven't seen / haven't been seeing him since / for then. 100 with the correct form of the

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