【题目】Not only______an explorer but also he was a great thinker______this thirties.
A.he was...in
B.was he...at
C.was he...in
D.he was...at

【答案】C
【解析】考查部分倒装。句意：他不仅是探险家而且他还是一位伟大的思想家。not only…but also…连接两个分句时，如果not only位于其所在的分句之首时，其后分句要主谓倒装。故选C。