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