Until we have discussed all the details, no decision _______ about any new operations.

A．will be made

B．is made

C．is being made

D．has been made

关于宫内节育器避孕原理，错误的是（）

A.抑制排卵

B.宫腔的机械作用

C.非细菌性炎性反应

D.前列腺素释放

E.活性物质释放