33．Drivers are supposed to limit the speed in neighborhoods because children ____ be playing there.
A
should
B
must
C
may
D
would
句子的意思是，在附近，司机应该减速行驶，因为可能有孩子在路上玩耍。may，表示可能，所以选C。
考查情态动词。
没有正确理解句子意思而误选其他选项。