Tom thanked his sisterhelping him his lessons.A. for; withB. to; inC. of; aboutD. on; at

发布时间：2020-08-21 17:12:00

Tom thanked his sister    helping him     his lessons.
A. for; with
B. to; in
C. of; about
D. on; at

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(答案→)A. for; with
B. to; in
C. of; about
D. on; at
解析：thank sb for sth表示因某事感谢某人；help sb with sth表示帮助某人做某事。
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