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

试题分析:句意:我不确定是否他明天来。A. that没有意义; B. if是否; C. when什么时间。根据tomorrow这里是if引导的宾语从句可以用将来时,根据句意故选B。
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