On farewell party the foreign teacher gratefully_____ all the helps from all the school.
A.thank
B.acknowledge
C.claim
D.declare
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B解析考查动词近义词辨析。句意为“在欢送会上，外籍教师衷心地感谢来自全校的帮助。”acknowledge用来感谢个人或单位提供的赠品,帮助等;thank用来表示提供赠品或帮助的个人。Thank和acknowledge都有“感谢”之意，其结构分别为“thank sb. (for sth./doing sth.)和acknowledge sth.，acknowledge是正式语，而thank为口语。