题目

—Mum, is the pair of gloves _____ mine?     —Yes．You have to wear another pair．     A．washing              B．have washed           C．having washed        D．being washed 答案：D 下图中a、b、c、d四点中，最容易发育成河流的是 [　　] A． a B． b C． c D． d