问题补充：
When I met my teacher and wanted to express how grateful I was, words me.
A. stopped
B. defeated
C. beat
D. failed
答案：
A. stopped
B. defeated
C. beat
(答案→)D. failed
解析：考查动词。A停止；B打败；C击打；D失败。这里的words failed me指“我说不出话来”。句意：当我遇到我的老师并想表达我是多么的感激，但我说不出话来。故D正确。
