23. Tom had to be told two or three times ________ he could remember what the teacher said.
A．beforeB．whenC．untilD．As
A

23．A(解析：考查連詞。before "到……為止；在……之前"when“當……時候"until"直到……為止”as“當……時候”，until強調(diào)動作的延續(xù)性，其中tell并非延續(xù)性動詞，另根據(jù)句意“老師說兩三遍之后湯姆才能記住�！币虼诉xA。)
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