1.people should speak openly , but careless words are ___to hurt others. A possible Bprobable Clikely Dsure 请详细讲解选项各用法 3.____wastre water in many rivers in our coty have been cleaned because of the effective measures. A a great number of B large quantities of C a number of D plenty of 答案是B请详细讲解 plenty of 可接不可数或可数名词 a great deal of也可接不可数名词? 谢谢