题目内容
（请给出正确答案）
The guards______to see her I. D. before they allowed her in the building.
A．demand
B．demanded
C．had demanded
D．will demand
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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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