问题补充：
—Is Linda a nice girl in your class?
—Yes, she is. She always helps us with math.
A. helps us learn math
B. helps us learning math
C. helps math with us
D. helps learn math
答案：
(答案→)A. helps us learn math
B. helps us learning math
C. helps math with us
D. helps learn math
解析：考查词组：help sb （to）do sth =help sb with sth，都是帮助某人某事，helps us with math.= helps us learn math，句意：--Linda是你们班的好女孩吗？--是的，她总是帮助我们学数学，故选A
