They were busy ________ an experiment when I came.A．doingB．to be doingC．with doi

题型：不详难度：来源：

They were busy ________ an experiment when I came.

A．doing

B．to be doing

C．with doing

D．to do

答案

解析

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。

举一反三

______ sweet and good, the birthday cake was soon eaten up by those children.

A．To taste

B．Tasting

C．Tasted

D．Having tasted

题型：不详难度：| 查看答案

______________ twice a year, whether it is a car, a bus or a truck, is the rule that every driver must obey in this city.

A．Examining	B．Examined
C．Having been examined	D．Being examined

题型：不详难度：| 查看答案

Put everything ________to you in your bag, not others.

A．belongs

B．belonged

C．belonging

D．to belong

题型：不详难度：| 查看答案

When ____ where he was born, Kale said he was a Londoner.

A．asking

B．asked

C．being asked

D．was asked

题型：不详难度：| 查看答案

___ time, he’ll make a first-class tennis player.

A．Having given

B．To give

C．Giving

D．Given

题型：不详难度：| 查看答案