The judge asked me many questions and ___.

A．they had difficulty being answered

B．answering them was with difficulty

C．they were difficult to answer

D．to answer them was to be difficult

《2000年国际贸易术语解释通则》中，在采用FOB术语成交时，卖方承担的基本义务是（）。

A、装运港船上交货

B、装运港船边交货

C、货交承运人

D、运费付至