3. They will fly to Washington they plan to stay for two or three days.A. whereB. thereC

问题补充：

3. They will fly to Washington, they plan to stay for two or three days.

A. where

B. there

C. which

D. when

答案：

(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。