题目内容
—How long have you been studying today?
—_______.
—_______.
[ ]
A. After 7 o'clock
B. At 7 o'clock.
C. 7 o'clock ago
D. Since 7 o'clock
B. At 7 o'clock.
C. 7 o'clock ago
D. Since 7 o'clock
D
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