专四考试第四部分是语法词汇题共有三十道题，同学们平时复习专四语法知识的同时可以做做专四全真模拟练习题。

　　1.____is announced in the papers, our country has launched a largescale movement against smuggling and fraudulent activities in foreign currency exchange deals.

　　A. What B. As C. Which D. That

　　2. All the flights____because of the snowstorm, we had to take the train instead.

　　A.were canceled B. had been canceled C. having canceled D. having been canceled

　　3. Once ____, this power station will supply all the neighboring towns and villages with electricity.

　　A. it being completed B. it completed  C. completed D. it completes

　　4. He might have been killed ____the timely arrival of the ambulance.

　　A. but for B. except for C. besides D. except

　　5. If you have never planted anything, you won’t be able to know the pleasure of watching the thing you have planted ____.

　　答案解析：

　　1. B)【句意】正如报界所宣传的那样，我国已发起大规模反走私和反欺诈性外币交易的运动。

　　【难点】as在这里是一个代词，常用在类似as is well known这样的句子中，意为“这一点”。

　　2. D) 【句意】所有航班因暴风雪都被取消，我们不得不改乘火车。

　　【难点】该句的前半句使用的是独立结构由于动作发生在过去，所以根据题意要求使用了完成式被动语态。

　　3. C) 【句意】这座电站一建成竣工，就将向周围城乡供电。

　　【难点】once在这里是连词，意为“一旦…就…”，后面省略了it is。[ZK)]

　　4. A) 【句意】要不是救护车及时到达，他可能就没命了。

　　【难点】but for 意为“要不是”，它的典型使用就是在虚拟语气的句子中，所以正合题意。

　　5. A)【句意】如果你从未种植过任何东西，你就不会明白观察你种植的东西生长所带来的快乐。

　　【难点】watch 后接不带to的不定式作宾语补足语。