单项选择题

The lecture was supposed to start at 8:00 a.m. , but the speaker ______ until 8. 30.

A．didn't turn up
B．don't turn up
C．haven't been turned up
D．hadn't been turning up
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单项选择题
______ after a long walk, Mike called and said he couldn't come to the party.
A．Having worn out
B．Be worn out
C．To wear out
D．Worn out
单项选择题
They are faced with the stone kinds of challenges and problems after graduation ______ we are.
A．as if
B．even if
C．as
D．when
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