The guards______to see her I. D. before they allowed her in the building.A.demandB.demande
The guards______to see her I. D. before they allowed her in the building.
A.demand
B.demanded
C.had demanded
D.will demand
The guards______to see her I. D. before they allowed her in the building.
A.demand
B.demanded
C.had demanded
D.will demand
The guards______to see her I. D. before they allowed her in the building.
A.demand
B.demanded
C.had demanded
D.will demand
方框图化简
A.(1-G1(S))G2(S)/(1+G1(S)*G3(S))
B.(1+G1(S))G2(S)/(1+G2(S)*G3(S))
C.(1+G1(S))G3(S)/(1+G2(S)*G3(S))
D.(1-G1(S))G3(S)/(1+G2(S)*G3(S))
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