题目内容
All of us found ______ difficult to work out the maths problem.
| A.what | B.that | C.which | D.it |
D
考查代词。本题用it作形式宾语,真正的宾语为不定式to work out the maths problem,故选D。
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| A.what | B.that | C.which | D.it |