单项选择题

I ______ to know about this.

A．was happened
B．happened
C．has happened
D．am happening
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单项选择题
Our school master praised our class ______ making
A．/; so much progress
B．for; so much progress
C．to; so many progress
D．for; such much progress
单项选择题
They hope to see you again ______.
A．before long
B．long before
C．long ago
D．after long
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