Có giải thích. 3. “What a lovely boat!” “I ……………half a year building this boat.” a. spend b. spent c. spending d. have spent 59. I’m hot because I ------------- for hours. a. have run b. have been running c. ran d. am running 73. “I took an exam this morning. It was really hard.” “------------- a lot before you took it?” a. Have you studied b. Did you study c. Have you study d. Do you study 74. A basket of apples, oranges, lemons --------- sent to me last Christmas. a. is b. are c. was d. were

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