Question

15. A number of volunteers from faraway cities.

   A. is   B. are   C. is come   D. are come

Answer 1

15. B

句意:许多志愿者来自很远的城市。a number of表本 “许多”，相当于many,修饰可数名词复数。作主语时，谓语动词用复数。故选B。