单项选择题

The students ______ the exercises, the teacher went on to explain the text.

A．doing
B．did
C．having done
D．to do
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单项选择题
The storm ______, they had to live in a cave.
A．has destroyed their hut
B．to destroy their hut
C．having destroyed their hut
D．being destroyed
单项选择题
______ nothing more to discuss, the CEO got to his feet, said goodbye and left the meeting room.
A．There was
B．Being
C．There being
D．As there being
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