问题
选择题
—I'm waiting for the mail. Do you know ________ it will arrive?
—Usually it comes by 4: 00. [ ]
A. how
B. where
C. when
D. what
答案
答案：C
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—I'm waiting for the mail. Do you know ________ it will arrive?
—Usually it comes by 4: 00. [ ]
A. how
B. where
C. when
D. what
答案：C