单项选择题

_____ yesterday _____ I learned that the famous scholar would give a lecture on IT industry.

A．It was not until; when
B．It was until; that
C．It was not until; that
D．It was until; then
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单项选择题
The heavy rain _____, the students went on planting trees.
A．had stopped
B．stopped
C．having stopped
D．being stopped
单项选择题
Television is another major means of communication, _____ us to see as well as _____ the performers.
A．permitting; to hear
B．permitting, hearing
C．to permit; to hear
D．to permit; hearing
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