Question

I was about to go to bed _____ someone knocked at the doo

I was about to go to bed _____ someone knocked at the door. A．when B．then C．at the time D．and

Answer 1

A

考查固定搭配。be about to do sth. when sb. did sth.意为“正要做某事时，这时，有人......”。句意“我正要去睡觉时，这时有人敲门。”故选A。