单项选择题

Mr. Smith insisted that he（）the work all by himself, but nobody believed him.

A．had done
B．have done
C．did
D．do

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单项选择题
What time is it now（）

A．9:00
B．8:20
C．8:40
D．9:20
单项选择题
Which of the following statements, is false according to the dialogue（）

A．He is doing research.
B．He works long hours in the lab.
C．He is making progress.
D．He was unhappy until recently.
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