Compared with last year,our pay has increased by about 1500 yuan.和去年相比,我们工资增加了大约1500元。A.has increased????? B.has increased to?????? C.has increased by解答：C 为正确答案. 介词by表示增加/减少的变化幅度。【1】increase? by +表示增加幅度? 增加了......The rate of inflation increased by 2%.通货膨胀率增长了2%。They've increased the price by 50%.他们已经把价格提高了50%。Japan's industrial output increased by 2%.日本工业产量增长了2%。【2】increase? to +表示增加到结果? ?增加到......The population has increased to 1.8 million.人口已已经增加到了180万。By 2050 the world's population is expected to increase to about 9.1 billion.??到了2050年,世界人口预计会增加到91亿左右.