英语句子转换The desert was once a green land,but later the trees w

英语句子转换The desert was once a green land,but later the trees were cut down.As a result,the san
The desert was once a green land,but later the trees were cut down.As a result,the city was buried by sand.
The desert was______with trees ,but later the trees were cut down,which_______ ______the city _________ _________by sand.