The class visits an airport and learns how airplane traffic is controlled and how planes are kept in safe condition.为什么control、keep要+ed?

The class visits an airport and learns how airplane traffic is controlled and how planes are kept in safe condition.为什么control、keep要+ed? The students--------(have)an English class yesterday Quiet!The students_(have)an English class. Quiet!The students( )an English class The zoo is an interesting place to _____.A.visit B.visit to C.Visits D.Visit for We are having an art class in the classroom 对an art class提问 the speak chinese in an english class.(改成否定句) The students _________(have) an English class every day. The boy( ) (have) an English class every day? 连句子:they,have,an,english class,in the classroom The boys ___(not have )an English class now. The class are having an English l______急 The English class b____ with an interesting game. (The students )are having an English class 加( )部分提问___ ____ ____an Englishi class? The class are taking an English test now中的class用复数are? 英语翻译A static inner class has no reference to an instance of the enclosing class. the class began half an hour ago的同一句 the calss()()()for half an hour . We are going to have an exam _____.A:in the class B:in a class C:at the class D:in class