I am not sure _____ he will come here. _
问题:
I am not sure _____ he will come here. ______ he comes here, please let me know. [ ]
A. that, When
B. that, If
C. if, Whether
D. whether, When
I am not sure _____ he will come here. ______ he comes here, please let me know. [ ]
A. that, When
B. that, If
C. if, Whether
D. whether, When