单项选择题

Don't walk near the cliff edge. It's a ______ drop to the sea.

A．rigid
B．plain
C．sheer
D．forgoing
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单项选择题
By the time she takes the entrance examination, Louis ______ Spanish for five years.
A．had been studying
B．has studied
C．will have been studying
D．will study
单项选择题
Shakespeare is the greatest playwright ______ England has ever had.
A．who
B．which
C．whom
D．that
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