问题补充：
It was his office.
A. not until the rain stopped did he leave
B. not until did the rain stop that he left
C. not until the rain stopped when he left
D. not until the rain stopped that he left
答案：
A. not until the rain stopped did he leave
B. not until did the rain stop that he left
C. not until the rain stopped when he left
(答案→)D. not until the rain stopped that he left
解析：考查强调句：句意：直到雨停了，他才离开办公室。这是强调句：It was not until…that…直到…才…，注意这不是倒装句，not until放在句首才使用倒装句，选D。
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