问题补充:
He tries English well. And he practices English every day.
A. to learn, to speak
B. learning,speaking
C. to learn,speaking
D. learning,to speak
答案:
A. to learn, to speak
B. learning,speaking
(答案→)C. to learn,speaking
D. learning,to speak
解析:句意:他努力学好英语,而且每天都练习说英语。try to do,意为“努力去做”,try doing意为“试着去做”;practice doing意为“练习做某事”,practice后面只能跟doing做宾语,故选C。