单项选择题


A．useful
B．effective
C．helpful
D．creative
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单项选择题
______ is known, he is such a beloved teacher ______ we students all expect.
A．That, which
B．Which, as
C．As, as
D．As, that
单项选择题
A．agoB．pastC．aheadD．before
A．ago
B．past
C．ahead
D．before
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