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,

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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,
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,

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,
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