At Sam’s birthday party he had many guests who were friends of his.A. mostlyB. usuallyC.

问题补充：

At Sam’s birthday party he had many guests, who were friends of his.

A. mostly

B. usually

C. specially

D. nearly

答案：

(答案→)A. mostly

B. usually

C. specially

D. nearly

解析：考查副词：A. mostly大部分B. usually通常C. specially特别，尤其D. nearly几乎，句意是：在Sam的生日聚会上有很多客人，大部分是他的朋友。选A。