A.易感者积累
B.病原体变异
C.人口流动
D.发病率下降
E.季节变化
第2题
They failed to pass the exam last time, I regretted ______.
A.to be not able to help
B.being unable to help
C.being not able to help
D.not be able to help
第3题
They failed to pass the exam last time. I regretted ______.
A.being unable to help
B.to be not able to help
C.being not able to help
D.not be able to help
第4题
They failed to pass the exam last time. I ______ (后悔没能帮他们一把).
第5题
They failed to pass the exam last time, I regretted______.
A.to be not able to help
B.being unable to help
C.being not able to help
D.not be able to help
第6题
They failed to pass the exam last time; I regretted______.
A.to be not able to help them
B.being unable to help them
C.being not able to helping them
D.not be able to help them
第7题
They failed to pass the exam last time, I regretted ______.
A.to be not able to help
B.being unable to help
C.being not able to helping
D.not be able to help
第8题
They failed to pass the exam last time; I regretted _______.
A.to be not able to help
B.being unable to help
C.being not able to helping
D.not be able to help
第9题
She failed in the math exam again , which has made her__________(失去了在数学方面的信心).
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