. _______ his return from Japan, Prof. Li went directly to his laboratory and started working with his colleagues.
. _______ his return from Japan, Prof. Li went directly to his laboratory and started working with his colleagues.
A.Upon
B.At
C.Within
D.Over
正确答案是A
扫描二维码免费使用微信小程序搜题/刷题/查看解析。
版权声明：本文由翰林刷题小程序授权发布，如需转载请注明出处。