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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
