The teacher asked the girl again, raising his voice a bit, but still_______no answer.

A．receiving

B．received

C．receive

D．to receive

19世纪初美国发展工业的有利条件是：（）①有巨大的海外市场②国际环境优越、少受战争之害③移民提供了劳动力和先进技术④国内资源丰富、市场广阔

A.①②③④

B.①②③

C.①②④

D.②③④