Question

In which sentence is the subject understood? A. It is up to you how to decorate your room. B. Trying to simplify the clutter was a huge undertaking. C. Shake it well before pouring it into the glass. D. Your day skiing will be the best fun you'll ever have.

Answer 1

The subject is understood in 'C'.

The complete sentence, including the subject, would have
been "You shake it well before pouring...".