Question

They were busy ________ an experiment when I cam

They were busy ________ an experiment when I came. A．doing B．to be doing C．with doing D．to do

Answer 1

A

试题分析：考查固定搭配。固定搭配：be busy doing sth忙于做某事；be busy with sth忙于某事；句意：当我来的时候，他们忙于做实验。故A正确。 点评：在高中的学习中平时要多积累固定搭配的用法，考试时只能凭借记忆力来答题，尤其是单项选择很难推出某个搭配的意思，所以平时的积累记忆是尤其重要的。