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I must go home now.I have been away from home____

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I must go home now.I have been away from home____
A since 9 o'clock B for two hours ago C for 9 o'clock D at 9 o'clock
I must go home now.I have been away from home____
答案:A
解析:since 后面接 时间点,如选项A
for后面接时间段 ,所以B应该去掉ago,C后面接了时间点.错误
at后面接时间点一般表示动作正在进行,用进行时态,句子使用了完成时态,选择A
since 一般用于完成时态中
翻译:我现在必须回家了,我自打九点就离开家了
无疑后请采纳.
书山有路勤为径,学海无涯苦作舟.
-----------与君共勉-----------