The suggestion by the teacher is available.
A. put forward
B. putted forward
C. putting forward
D. put on
网友回答
(答案→)A. put forward
B. putted forward
C. putting forward
D. put on
解析:put forward意为“提出”,是过去分词作定语,修饰suggestion. 分词作定语时,如果被修饰词是分词动作的执行者,用现在分词主动式;是承受者则用过去分词或现在分词的被动式。本题suggestion是put forward的承受者,而put的过去分词为put,故A项正确。D项不合题意。