---- Where did you watch the national flag being raised last Monday morning?
---- It was on the square we flew kites sometimes.
A. which
B. that
C. to which
D. where
网友回答
A. which
B. that
C. to which
(答案→)D. where
解析：考查强调句的省略形式。该句为强调句的省略形式，完整为 It was on the square we flew kites sometimes that I watched the national flag being raised last Monday morning。