When his mother came in the boy pretended.A. readingB. being readC. to readD. to be readi

问题补充：

When his mother came in, the boy pretended.

A. reading

B. being read

C. to read

D. to be reading

答案：

A. reading

B. being read

C. to read

(答案→)D. to be reading

解析：考查动词不定式用法。固定搭配pretend to do sth假装做某事；如果不定式的动作是与谓语动词同时发生，那么就使用不定式的进行式to be doing；如果不定式的动作发生在谓语动词之前，那么就用不定式的完成式to have done。句意：当他的妈妈进来的时候，那个男孩假装在读书。根据句意说明他假装读书这个动作是与妈妈进来同时发生的，故D正确。