芝加哥交易所发明了全球期货交易市场的两大基石,这两大基石是
A. 会员制
B. 保证金交易
C. 杠杆制度
D. 标准化合约
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How can you possibly miss the news? It ________ on TV all day long.
A. has been
B. had been
C. was
D. will be
-Sorry to have interrupted you. Please go on.-Where was I?-You ________ you didn’t like your father’s job.
A. had said
B. said
C. were saying
D. had been saying
I arrived late; I ________ the road to be so icy.
A. wouldn't expect
B. haven't expected
C. hadn't expected
D. wasn't expecting
I ________ while reading the English textbook. Luckily, my roommate woke me up in time!
A. had fallen asleep
B. have fallen asleep
C. fell asleep
D. fall asleep