摘要：15．Whatwouldhavehappened.--asfar asthe riverbank? A．Bob had walked farther B．ifBob should walk farther C．had Bob walked farther D．ifBob walked farther 16·How 1 wish every family--a 1argehouse With a beantifal garden! A．haS B．had C．will have D had had 17-My sister advised me that I--aecept the invitatiOn． A-could B．must C.should D．might 18·IhavebeenworkingforovertwenD,years and seldem~sotired aS now A．Ihavefelt BIhadfelt C．havelfelt D．hadtfelt

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