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)
I think it must have been in 1967 ______ I visited the Great Lake the first time.
I think it must have been in 1967 ______ I visited the Great Lake the first time.
A：when
B：which
C：where
D：that
A：when
B：which
C：where
D：that
英语人气：551 ℃时间：2019-10-19 01:37:42
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