氨基甲酸酯类农药中毒抑制胆碱酯酶活性的机制

A．使胆碱酯酶活性水解

B．使胆碱酯酶活性老化

C．使胆碱酯酶活性丧失

D．与胆碱酯酶分子结合

E．与胆碱酯酶磷酰基结合

— Jenny took the 8:00 bus to Guangzhou this morning.

— Really? He _____ the 9:00 train. It's much more comfortable and safer to travel by train. [ ]

A. could have taken

B. should take

C. must have taken

D. can take