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

試題分析：根據(jù)since后面跟從句或表示時間點的短語，for后面跟表示時間段的短語的用法和they可知，后面應(yīng)該是從句，故應(yīng)該排除BD；又根據(jù)since后面的從句用過去時，可知本題應(yīng)該選A。
點評：完成本題需要注意兩點：一個是since和for都可用于現(xiàn)在完成時，since后面跟從句或表示時間點的短語，而for后面跟表示時間段的短語；一個是since后面應(yīng)該用過去時。
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