When he is free, he often helps his parents _______

试题详情及答案解析

When he is free, he often helps his parents ________ some housework.

A．does	B．do
C．doing	D．did

答案：B

试题分析：句意：当他有空的时候，他经常帮他父母做家务。help sb （to） do，帮助某人干某事。结合句意，故选B
考点：考查非谓语动词的用法。