This is the key the ___ciassroom.A.to B.of C.at D.in
问题描述:
This is the key the ___ciassroom.
A.to B.of C.at D.in
答
你好,应该选择A;
the key to ....意思为【是..关键,是...钥匙】;是固定短语;
而且key后面的the应该是多余的,去掉即可;
答
A
答
to
固定搭配