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

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howlongisit___theclass___?Awhen..beginsBwhen..beganCsince..hadbegunDsince..began选择D是为什么么呢howlongisit

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
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

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
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?

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