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They have been doing morning exercises            they            up.
A.since, gotB.for, getC.since, getD.for, got
A

试题分析:根据since后面跟从句或表示时间点的短语,for后面跟表示时间段的短语的用法和they可知,后面应该是从句,故应该排除BD;又根据since后面的从句用过去时,可知本题应该选A。
点评:完成本题需要注意两点:一个是since和for都可用于现在完成时,since后面跟从句或表示时间点的短语,而for后面跟表示时间段的短语;一个是since后面应该用过去时。
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