問題詳情:
—I heard that many people planted trees on Tree Planting Day without stepping out this year. I wonder ▲ .
—They did this by taking part in“cloud planting" on the Internet.
A. what they did B. how they did that C. why they joined the activity
【回答】
B
知識點:賓語從句
題型:選擇題
Tags: