Ithinkitmusthavebeenin1967______IvisitedtheGreatLakethefirsttime.A：whenB：whichC：whereD：that
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题目内容：
I think it must have been in 1967 ______ I visited the Great Lake the first time.
A：when
B：which
C：where
D：that
优质解答
D
是强调句
It must have been.that.
是 It is.that.变化而来(表示肯定的猜测)
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