题干
There will not be enough space to the earth in the future.
A：live on
B：live in
C：live on in
D：live in on
答案(点此获取答案解析）
D
There will not be enough space to the earth in the future.
A：live on
B：live in
C：live on in
D：live in on
to explain so much about this theory to Peter. _______ , he is clever enough to understand it .