单项选择题

The policeman declared that the blow on the victim's head ______ from behind.

[A] should have been made
[B] must have been made
[C] would have been made
[D] ought to have been made

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单项选择题

______ human behavior may be caused by eating substances that upset the delicate chemical balance in the brain.

[A] Deliberate
[B] Consistent
[C] Primitive
[D] Abnormal

单项选择题

It was dark in the cave so she ______ a match.

[A] struck
[B] hit
[C] fired
[D] burned

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