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matter excuse result expression
play are playing have played were playing
matter excuse result expression
play are playing were playing playing
matter excuse result expression
play are playing have played were playing
B.C.D.四个选项中，选出一个最佳答案。 —Why didn’t Sally play the violin at the concert last night? —She said that her hand hurt, but that was only a（n）________ . I saw her play tennis just now. A.matter excuse result expression
IL-12分泌不足，使得Th0不能向Th1细胞分化 IL-12分泌不足，使得Th2向Th1细胞分化 IL-12分泌过多，使得Th0不能向Th1细胞分化 IL-12分泌过多，使得Th0向Th2细胞分化 IL-12分泌过多，使得Th2不能向Th1细胞分化
How many How soon How often How long
play are playing have played were playing
swim; play volleyball swimming; play volleyball to swim; playing volleyball swim; playing volleyball
hasn’t she has she isn’t she is she
why Sally will go abroad why will Sally go abroad how Sally will go abroad how will Sally go abroad
play are playing have played were playing
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