--- We went to see the man who was in hospital yesterday. --- .
A. So did we
B. So we did
C. We did so
D. Did so we
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(答案→)A. So did we
B. So we did
C. We did so
D. Did so we
解析：根据语境可知此题考查固定句型结构so + be (do, have, can …) + 主语”这一倒装结构说明前面所述的情况也适合于另一人或物，意为“……也一样”。(即甲如此，已也如此。)此句的含义是昨天我们去看了那个住院的人，我们也是。表示我们也去了，故选A