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1.If you _____ take a seat for a moment,Mr.Franks will be wi

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1.If you _____ take a seat for a moment,Mr.Franks will be with you soon.
A.may B,should C.must D,will
2.Why _____a stepladder have four legs _____three are more stable
A,must;because Bmust ;when C.could ;if D,shoule ;once
3.The conference_____a full week bt the time it ends
A.must have lasted B,will have lasted C,would last D.has lasted
1 D -------表意愿
2 B ------表惊讶
3 B ------- 主将从现,by结构,用完成式时态,强调行为,不强调状态.