13. had they reached the 30th floor they realized that they had forgotten to take the key.
A. Hardly; than
B. Hardly; when
C. No sooner; when
D. No sooner; then
网友回答
A. Hardly; than
(答案→)B. Hardly; when
C. No sooner; when
D. No sooner; then
解析:可联系答.案.网客服索取。