问题
选择题
John was seen ____ in by the back door, but nobody saw him ___.
A．to come…to leave
B．come… leave
C．to come… leave
D．come…leaving
答案
答案：C
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John was seen ____ in by the back door, but nobody saw him ___.
A．to come…to leave
B．come… leave
C．to come… leave
D．come…leaving
答案：C