____ before we depart the day after tomorrow, we should have a wonderful dinner party.
A、HadtheyarrivedD
【句意】如果他们能在我们后天离开之前赶到的话，我们就举行一次盛大的宴会。
【难点】表示将来不可能发生的事实，常用虚拟语气，主句的谓语为should+动词原形(适用于第一人称主语)或would,could,might+动词原形(适用于其余人称主语);而条件句的谓语应该用should+动词原形，wereto+动词原形或直接用动词的过去时(如be改用were)。
____Thewaterleftinthekettle,thedoctorputseveralthingsheunwrappedfromahandkerchief.
Thepresentsituationforcedusto____thispolicy.
---Wouldyouliketogooutforawalkwithus?
---_____,butImustfinishmyhomeworkfirst.
—Icametoyourofficeyesterdaymorning,butnobodywasin.
—Oh,we__________ameetinginthemeetingroom.
It’snecessary_________usallto________
