631.Dina,______ for months to find a job as a waitress,finally took a position at a local advertising agency.
A.struggling
B.struggled
C.having struggled
D.to struggle
632.The retired man donated most of his savings to the school damaged by the earthquake in Yushu,______ thye students to return to their classrooms.
A.enabling
B.having enabled
C.to enable
D.to have enabled
631.答案是C;分词短语作时间状语，其逻辑主语Dina与struggle为主动关系，故用现在分词；根据for months的暗示，用分词的完成式。
632.答案是A;现在分词enabling表示必然结果。短语enable sb.to do sth.使某人能干某事。
