题目内容

【题目】—Do you know our town at all?

— No, this is the first time I ______ here.

A. was B. have been C. came D. am coming

【答案】B

【解析】

试题分析：考查现在完成时。this is the first time后跟现在完成时。常用表达方式：this/it is the first time后面跟定语从句，时态用现在完成时has/have done结构， 意思是第一次做某事； 当this/It is替换this was/It was时，即this/it was the first time后面也跟定语从句，但这时从句时态要用过去完成时had done结构。句意：你全面了解我们的城镇？不，只是我第一次来到此地。故选B

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BrainGate is the idea of Professor John Donoghue and his team of researchers at the Brown Institute for Brain Science,USA. BrainGate is attached directly to the brain. First of all,gold wires are put into the part of the brain that controls movement. These are then connected to a small computer chip(芯片) . When the person thinks about different movements,this creates electrical signals,which are picked up by the chip. After this,the signals that are created by the brain are sent back to a computer,which changes the signals into movements. Finally,the computer uses the robotic arm to carry out these movements. BrainGate can already be used to write an e-mail or play computer games,just by brain power.

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A. By developing a wireless version.

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