单选题
The student _____ continuing his studies when he had to return to his home country unexpectedly.
Ais considering
Bwas considering
Cshould consider
Dhas considered
正确答案
答案解析
when引导的时间状语从句中，谓语动词为一般过去时，可知空格中动词也为过去时，故B项正确。