单项选择题

We had to _______ into the ground to find water.

A．dig deeply
B．dig deep
C．deeply dig
D．deep dig
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单项选择题
It is useless trying to persuade him to adopt our suggestion; he is such a______ man.
A．tough
B．strict
C．stubborn
D．stern
单项选择题
You ______ John in the street this morning. He's been dead for ages.
A．mustn't see
B．mustn't have seen
C．couldn't see
D．couldn't have seen
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