A.that B.this C.when D.which
单项选择题Mrs. White became a teacher in 1985. She()for twenty years by next summer.
A.will teach B.will have taught C.has been teaching D.will have been taught
单项选择题I found the washing machine I had had()broke down again.
A.it repairing B.repaired C.it repaired D.to be repaired