题目内容
（请给出正确答案）
A．Drags have caused American people to have no enough drags of medical use.
B．Drugs have mined many American people's mind.
C．Drags have caused many American people to lose health.
D．Both B and C.
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【C2】______
A．should have been caused
B．could have been caused
C．would have been caused
D．ought to have been caused
Antibiotics have no effect on diseases caused by viruses.
A．Y
B．N
C．NG
Problems caused by ______ nationality have to be properly coped with.
A．mutual
B．bilateral
C．binary
D．dual
A、had caused
B、would have caused
C、would cause
D、caused
A.must have caused
B.might have caused
C.had caused
D.can cause 参考
Which of the following is TRUE？
A．Environmental changes must have caused the end-Permian mass extinction.
B．Massive volcanic eruptions might have caused the end Permian mass extinction.
C．The disappearance of dinosaurs was a consequence of the end-Permian mass extinction.
D．Marine animals appeared as a result of the end-Permian mass extinction.
A、caused
B、causing
C、to have caused
D、to be caused
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