问题
选择题
I was told to meet Mr. Green at the airport. But I don't know ______ he will arrive. [ ]
A. where
B. why
C. how
D. when
答案
D
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I was told to meet Mr. Green at the airport. But I don't know ______ he will arrive. [ ]
A. where
B. why
C. how
D. when
D