The cost of living__up by ten percent at the end of last year.选项为went\has gone\had gone\go.

Thank you.

The cost of living__up by ten percent at the end of last year.
选went
由于the end of last year是过去的事，而且不是一个时间段，早已完成，因此用一般过去时~

答案b state此处意为“（="make" sth. know, announce）宣布，通告，声明（口头的或书面的）”，如：it is stated that all the accident were killed.(据宣布，事故中全部人员无一幸免。)suggest建议，是表示欲望意义的动词，从句中要用虚拟语气（should +动词原形）。note(=notice)“注意到”，如：it was noted that the temperature rose during this time.