It may rain --- you’d better take an umbrella .
A. in case
B. in this case
C. in no case
D. under the case
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(答案→)A. in case
B. in this case
C. in no case
D. under the case
解析：本题考查case的短语的用法。in case以防；万一 ； in this case在这种情况下；in no case绝不。没有under the case这种搭配。句意：可能下雨--你最好带把伞， 以防万一（下起来）。