Our class teacher has been back _____half an hour A、since B、in C、 for D、after注明理由

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Our class teacher has been back _____half an hour A、since B、in C、 for D、after注明理由
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Our class teacher has been back _____half an hour A、since B、in C、 for D、after注明理由
Our class teacher has been back _____half an hour A、since B、in C、 for D、after
注明理由

Our class teacher has been back _____half an hour A、since B、in C、 for D、after注明理由
选C,表示回来已经半小时了,表动作或状态持续多长时间用for+时间段引出.此题是be back表示状态持续了半小时.再例如:He has been reading for 2 hours.表示动作read持续了2hours.

C
前面是现在完成时, 后面为一个 时段 故用 for "长达“
请及时采纳,不懂继续问( 天天在线 )
(*^__^*) 祝学习进步! 谢谢!

b在。。。时间之内,用in