单项选择题

We learned that Columbus has discovered America in 1492.

A．had discovered
B．discovers
C．discovered
D．was discovering
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单项选择题
Don't be late. I hate to be waiting for a long time.
A．being keeping
B．be kept
C．to be kept
D．be keeping
单项选择题
He had studied hard, he would have been able to pass the exam.
A．He had studied harder
B．if only he studied more
C．Had he studied harder
D．When he studied more
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