how long is it _the class _?

how long is it ___the class ___?
A when .. begins B when .. began C since.. had begun D since .. began
选择D 是为什么么呢

ahuahua4 1年前已收到2个回答举报

太阳有约幼苗

共回答了21个问题采纳率：95.2% 举报

D
it is +一段时间+since+一个过去的动作
翻译为：课开始了多久了?

1年前

莱克特幼苗

共回答了208个问题举报

how long 对一段时间提问， since the class began 表示一段时间

1年前

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