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.—Do you still remember when we went to the summer palace?

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.—Do you still remember when we went to the summer palace?
—I can't remember it well,but it ____ sometime last July.
A.must have been B.might be C.could be D.might have been
..不懂,为什么不是B?那C呢?
2.According to a UN report,one third of the world population have no ___to drinking clean water and health care.
a.means b.approach c.channel d.access
这个选什么?approach还是access?区别是什么呢
3.Hubei Province is __north of Hunan;Wuhan,its capital city,lies___the Changjiang River.
A.to;on B.in the ;in C./;on D.to the;in
1.might have done 对过去可能性的一种猜测.
2.have access to 词组:使用,接近
3.north of Hunan 副词,表示方位,不用加介词,如果加在这里该用on,表示两地接壤.城市坐落与河流关系,用介词on.
再问: aceess to后面可以加doing吗?
再答: 不清楚,主要看词组的。