单项选择题

The students ______ busily when Miss Brown went to get a book she ______ in the office.

A．had written, left
B．were writing, has left
C．had written, had left
D．were writing, had left
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单项选择题
Tom failed the exam but his sister ______.
A．got in
B．got over
C．got out
D．got through
单项选择题
-- I usually go there by train. -- Why not ______ by boat for a change
A．try to go
B．trying to go
C．to try and go
D．try going
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