【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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