3. ---Did your parents take you to go on holiday?

--- I’d love_______ , but there was no room in the car.

A．to

B．to be taken

C．to have been taken

D．to take

焊接工字形等截面简支梁在（），整体稳定系数φ_b最高。

A.跨度中央一个集中荷载作用时 

B.跨间三分点处各有一个集中荷载作用时 

C.全跨均布荷载作用叫 

D.梁两端有使其产生同向曲率、数值相等的端弯矩的荷载作用时