单项选择题

The boy was so ______ on his stamp collection that he did not hear my footsteps.

A．absorbed
B．engrossed
C．engaged
D．intent
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单项选择题
Our Math teacher must be in his office now. No, he ______ be there. I saw him in the library a minute ago.
A．can't
B．couldn't
C．mustn't
D．wouldn't
单项选择题
Whose ______ was it to make up such a seemingly careful plan
A．idea
B．thought
C．purpose
D．dream
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