问题
选择题
Do you remember a certain occasion ________ you were in trouble and at that moment I gave you a hand.
A．when
B．which
C．why
D．where
答案
答案：A
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Do you remember a certain occasion ________ you were in trouble and at that moment I gave you a hand.
A．when
B．which
C．why
D．where
答案：A