A: be better enforced, and its crime rate reduced
B: better enforced, and its crime rate reduced
C: could be better enforced, and it could reduce its crime rate
D: better enforced, and its crime rate could reduce
E: could be better enforced, and its crime rate reduce
答案不確定 CD上最多人答 a or b
我覺得是b
A的話 不知道那個be是什麼變來的??

大大們覺得呢??