They don’t feel safe in our town at night because it so dangerous. There’s a robbery every

问题补充：

They don’t feel safe in our town at night because it so dangerous. There’s a robbery every week now.

A. becomes

B. became

C. has become

D. had become

答案：

A. becomes

B. became

(答案→)C. has become

D. had become

解析：根据题意，在我们镇上，他们在晚上感到不安全，因为它已经变得如此危险。每周都有一次抢劫了。可知原因状语从句叙述的是已经发生的事情，故用完成时态，选C。