Whenpeoplecutdownbigtrees,newtreesshouldbeplanted．

問題詳情：

When people cut down big trees, new trees should be planted． _______ they will have no trees to cut down in the future．

A． If not             B． If so             C． If no so          D． If don’t

【回答】

A

知識點：倒裝與省略

題型：選擇題