问题
选择题
My brother usually ___ his classroom after school. But now he ___ basketball.
A．cleans; plays
B．is cleaning; plays
C．cleans; is playing
D．is cleaning; is playing
答案
C
题目分析：句意: 我到妈妈通常在放学后打扫教室，但是他现在正在打篮球。由usually可知第一句是一般现在时，用第三人称单数cleans；由now可知第二句是现在进行时，用is playing，故选C。