Do earthquakes ________ often in North America?
(1)【◆题库问题◆】：[单选] Do earthquakes ________ often in North America?A．breakB．break outC．happen toD．occur
North(1)【◆题库问题◆】：[单选] Do earthquakes ________ often in North America?A．breakB．break outC．happen toD．occur