单项选择题

Only after I mailed the letter（）that I had forgot to put a stamp on it.

A．I remembered
B．did I remember
C．I didn't, remember
D．didn't I remember

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单项选择题
I had just started back for the house to change my clothes（）I heard shouts.

A．when
B．while
C．after
D．as
单项选择题
I wish that you（）such a bad headache because I'm sure that you would have enjoyed the concert.

A．hadn't
B．didn't have had
C．hadn't had
D．haven't had
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