–The manager says that there’s no hot water after8:00 tonight.

–You mean we ______ go to bed without a shower. How terrible!

A. can     B. have to     C. may

动态心电图判断抗心律失常药物疗效通常采用ESVEM标准，判定对短阵室性心动过速治疗有效的标准是（）。

A.减少≥50%

B.减少≥60%

C.减少≥70%

D.减少≥80%

E.减少≥90%