They don’t feel safe in our town at night because it         so dangerous. There’s a robbery every week now.  
A．becomesB．becameC．has becomeD．had become
C
根據(jù)題意，在我們鎮(zhèn)上，他們在晚上感到不安全，因為它已經(jīng)變得如此危險。每周都有一次搶劫了。可知原因狀語從句敘述的是已經(jīng)發(fā)生的事情，故用完成時態(tài)，選C。
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