here is a ( B )the river.
A.on B.over C.under D.in
( C )was difficult ( )the railroad.
A.That,to build B.That,building C.It,to build D.It,building
二.用所给单词的适当形式填空.
It was very diffcult ( to work )(work)out those maths problems.
here is a ( B )the river.
A.on B.over C.under D.in
( C )was difficult ( )the railroad.
A.That,to build B.That,building C.It,to build D.It,building
二.用所给单词的适当形式填空.
It was very diffcult ( to work )(work)out those maths problems.