单项选择题
A.He can’t explain the instructions clearly.B.He speaks too fast.C.He doesn’t understand the instructions clearly.D.He is deaf.
A、Ⅱ.Ⅲ.ⅣB、Ⅰ.Ⅱ.ⅣC、Ⅰ.Ⅱ.Ⅲ.ⅣD、Ⅰ.Ⅲ.Ⅳ