【題目】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:一旦你掌握了訣竅,你就不會再有任何困難了。主句用一般將來時,從句用一般現(xiàn)在時。故選D

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