The work（）by the time you get there. A: Awill have been done B: Bwas done C: Chad been done D: Dhas done

Shipment will be effected this month，subject to your L/C（）us in one week. A: Areaching B: Breaches C: Cwill reach D: Dhas reached

Tom（）since he lost his job three weeks ago. A: Ahas employed B: Bwas unemployed C: Chad been unemployed D: Dhas been unemployed

选出正确的下列一项描述 A: 胎盘合体细胞产生大量硫酸脱氢表雄酮(DHAS)经母体肝脏合成雌三醇，再由母体尿中排出 B: 胎儿肾上腺产生大量硫酸脱氢表雄酮(DHAS)经胎儿肝脏后至胎盘转化成雌三醇，再由母体尿中排出 C: 胎儿肾上腺产生大量雌三酮，经胎盘由母体尿中排出 D: 妊娠期间孕妇尿中所含的雌激素主要是雌二酮 E: 雌三醇由垂体分泌，而由尿中排出