3. They will fly to Washington, they plan to stay for two or three days.
A. where
B. there
C. which
D. when
网友回答
(答案→)A. where
B. there
C. which
D. when
解析：首先排除B项，There引导句子，应用句号与前句隔开。因为这里的先行词为“Washington”，所以其次应该排除掉D。将后面的句子补充完整，应该是They plan to stay in Washington for two or three days. 所以应该用 in which 或where连接这两个句子。