问题补充：
Look! How heavy the rain is! You’d better .
A. don’t go now
B. stay here when it stops
C. not leave until it stops
D. not to leave at once
答案：
A. don’t go now
B. stay here when it stops
(答案→)C. not leave until it stops
D. not to leave at once
解析：考查固定句型。Had better（not）do sth 最好（不）做某事，故选C.
