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The number of people invited fifty, but a number of them absent for different

A. were, was
B. was, was
C. was, were
D. were were

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We will firmly improve social security and rectify the polluted and disorderly environment

We have done a lot of trade with your company for the past five years.

古典经济学派的代表亚当.斯密认为只有自由贸易政策才能使各国按绝对利益进行贸易，分享国际分工的好处。()

A. 正确
B. 错误

The first bicycle was invented in_______.

A. 1780
B. 1790
C. 1880
D. 1890