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56._________A. excitedB. intendedC. interestedD.
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_________(58)A.to buy B.buyingC.having bought D.f
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56._________A. questionedB. acceptedC. confirmedD
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_________(58)A.to buy B.buyingC.having bought D.f
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_________(64)A.plentiful B.limitedC.irregular D.f
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_________(58)A.to buy B.buyingC.having bought D.f
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下列等式不成立的是___________。A.f1(t一t0)*f2(t+t0)=f1(t)*f2(t)B. C.f(t)*δ(t)=f(t)D.f(t)*