--How did he get infected?

--She ____the viruses without any protection.

A．exposed to

B．had exposed to

C．was exposed to

D．had been exposed

Oh, Janne, you’ve broken another glass. You ought ＿＿＿＿when you washed it.

A．be careful

B．to care

C．have cared

D．to have been careful