in a heavy rain the teacher fell ill and couldn’t but for a leave.A. Caught; to askB. C

问题补充：

in a heavy rain, the teacher fell ill and couldn’t but for a leave.

A. Caught; to ask

B. Catching; ask

C. Catching; to ask

D. Caught; ask

答案：

A. Caught; to ask

B. Catching; ask

C. Catching; to ask

(答案→)D. Caught; ask

解析：考查分词用法和固定搭配。形容词短语be caught in…遭遇；陷入；本句中的形容词短语caught in a heavy rain是对后面句子的主语the teacher的情况进行的说明，can’t but do sth不得不坐某事；句意：遭遇了大雨，这位老师病了，不得不请假。故D正确。