We know that a smile is usually a sign _____ people feel friendly and happy, but _____ we don’t know who the new person is?
A. that; what if B. when; what C. when; how about D. if; how
We know that a smile is usually a sign _____ people feel friendly and happy, but _____ we don’t know who the new person is?
A. that; what if B. when; what C. when; how about D. if; how
A