问题补充：
He usually goes to work on time ＿＿＿＿＿＿.
A. except for raining days
B. besides it rains
C. but that it rains
D. except on rainy days
答案：
A. except for raining days
B. besides it rains
C. but that it rains
(答案→)D. except on rainy days
解析：except后接动词不定式可与but连用，但except后还可接that, when, where等从句或介词短语，在表示对细节加以纠正之意时用except for。
