Miss Jones _______ music at Bardon School for five years when she was abroad and now she is an actress. |
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A. taught B. has taught C. had taught D. has been teaching |
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1年前
1年前
已知m,n是方程x2﹣2x﹣1=0的两根,且(7m2﹣14m+a)(3n2﹣6n﹣7)=8,则a的值等于( ).
1年前
1年前
1年前