单项选择题

Mary ______ at the bus stop for about an hour when Tom finally came and started to argue about what ______ before.

A．waited, happened
B．have waited, has happened
C．had waited, was happened
D．had been waiting, had happened
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单项选择题
Vicky, one of my doctoral students, had her dissertation(论文) ______ as soon as she finished ______ it.
A．to be typed, to write
B．typed, to write
C．being typed, writing
D．typed, writing.
单项选择题
The professor found no student in the lecture hall when he arrived. Only then did he realize that he came ______ early.
A．too much
B．so much
C．much too
D．much so
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