单项选择题

A．originals
B．origins
C．discoveries
D．resources
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问答题
S1. Thus, with one class possessing the requisite knowledge and experience, but lacking incentive and leisure, and the other class lacking the knowledge and experience, there was no means by which technical progress could be achieved.
单项选择题
A．The teacher postponed the conference.B．There won’t be a test this afternoon.C．The students will be attending the conferenceD．The students took a science test that afternoon.
A．The teacher postponed the conference.
B．There won’t be a test this afternoon.
C．The students will be attending the conference
D．The students took a science test that afternoon.
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