The number of unresolved cases _____ significantly this month.
กhas decreased
ขdecrease are
คhave decreased
งwere decrease
เฉลยอธิบาย
The head noun “number” is singular, so the present perfect verb is “has decreased.”
เฉลยอธิบาย
The head noun “number” is singular, so the present perfect verb is “has decreased.”