问题

you beento the Great Wall—Perhaps notin my memory. ________, it might have been during my early childhood.

A:If any
B:Ifso
C:If ever
D:If not

正确答案是：

同类题型

The young man, _____ several attempts to beat the world record in high jumping, decided to have another try.[ ]

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Are you familiar with the music — Yes There was a time _____ this kindof music was quite popular