—What's the matter, Sam?

—______. [ ]

A. I've got a fever

B. I bought a new bike

C. I got "A" in the math exam

D. I have taken my temperature

If we had become aware of danger earlier, we _____ to stay in that temporary shelter.

A．wouldn’t choose

B．wouldn’t be choosing

C．wouldn’t have been choosing

D．wouldn’t have chosen