题目内容：

In fact it was not until two weeks later _____ he sent me an e-mail telling me he had gone to Japan.
A.before B.when C.since D.that

优质解答

选D.
强调句型,“it is.that.“,这里强调的是“两周之后”,即 not until two weeks later ；后面半句意思是“他给我发邮件告诉文他去日本时”.
联系起来句意为“他给我发邮件告诉文他去日本时,已经是两周之后啦!”