11. Although the lesser cornstalk borer is widely distributed, control of them is necessary only in the South. (A) the lesser cornstalk borer is widely distributed, control of them is (B) widely distributed, measures to control the lesser cornstalk borer are (C) widely distributed, lesser cornstalk borer control is (D) the lesser cornstalk borer is widely distributed, measures to control it are (E) it is widely distributed, control of the lesser cornstalk borer is 答案是D 想问下 D 答案中measures to control it are necessary only in the South 划线的to的不定式 是作measures的定语么
还有杨鹏长难句中的一句话的问题 But the debate could not be resolved because no one was able to ask the crucial questions in a form in which they could be persued productively. 为啥划线的是俩介词 in? in which定的是前面the crucial questions么? 可以把in which改成that 作a form的同位语么