题目

In a sports team each player has a clear role, and there are few occasions _______ members are confused or uncertain of their roles. A. which    B. when      C. that      D. how 答案：B13．王叔叔家的客厅是一个长5米，宽40分米的长方形，如果在客厅的地面上铺上边长是5分米的地砖，需要多少块？