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• 13. Alan and I were playing the guitar then, but my sister ______.(A) was (B) did (C) didn’t (D) was
• 14. When I was in junior high school, I ______ swim or surf.(A) couldn’t (B) can’t (C) don’t (D) was
• 15. Doctors always tell us ______ more fruit and vegetables（蔬菜） , but it is not easy ______ a person
• 16. Singing lessons ______ not easy for John when his voice wasbroking（變聲） .(A) were (B) was (C) are
• 17. Jeremy is good at ______ basketball because he practices______ it every day.(A) play； playing (B