I’m not sure ______ he will come tomorrow.
A. that                    B. if                  C. when

B

解析試題分析：句意:我不確定是否他明天來。A. that沒有意義； B. if是否； C. when什么時間。根據(jù)tomorrow這里是if引導的賓語從句可以用將來時，根據(jù)句意故選B。
考點：考查連詞的用法。

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