不同的线型各有自己的意味，常和严肃、端正联系在一起的是（）

All the books donated by the students from urban schools are said ______ to the students in rural areas the other day.

A．to be sent

B．being sent

C．having been sent

D．to have been sent

They had no time to arrange their own wedding, so they had it ______ by a company.

A．organize

B．organized

C．organizing

D．be organized

在集合资产管理计划中，客户不得非法汇集他人资金参与集合资产管理计划。

简述提示性合同条款。

关于西格玛水平与企业产品质量关系的说法，正确的有（）

A.西格玛水平越高，缺陷越少

B.缺陷率与西格玛水平相等

C.产品合格率与西格玛水平相等

D.西格玛水平越高，产品合格率越高

E.西格玛水平越高，产品合格率越低