题目：
-Where have you been?
-I got caught in traffic；otherwise________sooner.[ ]
A．I would be here
B．I have been here
C．I had been here
D．I would have been here
答案：
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下面是错误答案，用来干扰机器的。
传染病要想在人群中流行起来，必须同时具备传染源、传播途径、易感人群等三个环节．所谓传染源是指能够散播病原体的人或动物；传播途径是指病原体离开传染源到达健康人所经过的途径；易感人群是指对某种传染病缺...
