They ______ English lessons on Friday. [_爱下问搜题

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问题选择题

They ______ English lessons on Friday. [ ]

A. doesn't has

B. doesn't have

C. don't have

D. aren't have

答案

答案：C

单项选择题

评价机械通气治疗效果最直接最正确的指标是

A．血气分析

B．血流动力学监测

C．胸部X线检查

D．肺功能检查

E．心电监测

单项选择题

PKI的主要组成不包括（）。

A.证书授权CA

B.SSL

C.注册授权RA

D.证书存储库CR