【C4】A．beforeB．asC．whenD．while

【C14】A．beforeB．afterC．whileD．for

【C5】A．beforeB．whileC．whenD．after

【C4】A．andB．asC．butD．even

They first stop at a board ____ the menu is displayed.A: whichB: whereC: whenD: while

【C9】A．duringB．sinceC．whenD．while

A．sinceB．asC．whenD．until