The knowledge that his friends have deserted him is a (n) pill for Mr. Smith to swallow.A

问题补充：

The knowledge that his friends have deserted him is a (n) pill for Mr. Smith to swallow.

A. extra

B. common

C. bitter

D. effective

答案：

A. extra

B. common

(答案→)C. bitter

D. effective

解析：考查形容词：A. extra额外的，B. common普通的，C. bitter痛苦的，D. effective有效的，句意：知道朋友抛弃了他是斯密斯先生吞下的苦药。选C。