单项选择题

We will not attack () we are attacked; if attacked, we will certainly counter-attack.

A．if
B．when
C．unless
D．even if

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单项选择题
Do you hear someone knocking at the door Yes, I did. I heard him () three times.

A．knocking
B．knocked
C．being knocking
D．knock
单项选择题
The two thieves fled the town separately, () a bag.

A．each carrying
B．whose that watch is
C．whose watch is that
D．whose watch is
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