He found () difficult to work out the problem in such a short time.A.that B.it C.so D.this
问题描述：
He found () difficult to work out the problem in such a short time.A.that B.it C.so D.this
还有一道：There are some low mountains () the coast.(填一介词）要讲解,
答
选B
it 作形式主语,动词不定式作真正的主语.
There are some low mountains () the coast.（beside）
beside the coast 在海岸边下面那题介词答案上是to，求翻译，besides也是对的，谢谢我觉得to在这里是山和山连在一起的意思这道题算不算是有争议