题目内容
Some English scientists are identifying problems ____ technology in the 21st century. If solved, the solutions could change the world.
A.facing B.faced C.being faced D.having faced
A

|
题目内容
Some English scientists are identifying problems ____ technology in the 21st century. If solved, the solutions could change the world.
A.facing B.faced C.being faced D.having faced
A
|