40. ---- I have some trouble with this problem Could you do me a favour?----- Sorry, you may turn to him He has been ______ and he may know how to solve it(本题1.0分) A、 experience B、 expert C、 skill D、 around
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53[填空题,0.7分] Fill in the blanks with appropriate p
53[填空题,0.7分] Fill in the blanks with appropriate pronoun: The ladder __________