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【题目】Once you ______ the knack of it, you will have no further difficulty. ( )

A.shall haveB.had hadC.are havingD.have

【答案】D

【解析】

句意:一旦你掌握了诀窍,你就不会再有任何困难了。主句用一般将来时,从句用一般现在时。故选D

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