网址：http://m.1010jiajiao.com/timu3_id_2938637[举报]
Upon ________ his studies, he started travelling in China.
A. finish B. finishing C. he finished D. finished
____ finishing his homework, he went to play basketball.
A．In
B．Upon
C．At
D．With
[ ]
A. In B. Upon C. At D. With