定金具有担保作用,定金不超过合同标的额的(),明确定金的归还时间或者可抵作货款。
A、10%
B、15%
C、20%
D、30%
参考答案:C
---The light was on all night long.
---Yes. It seemed that Mike ________. He was the last one to leave the office.
A.was to be blamed
B.was to blame
C.had been blamed
D.should be blamed
简述小麦黄矮病的典型症状。