How long is it __ the metting_?

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How long is it ____ the metting___?
A.When,began B.since,began C.when,begins D.since,has been begin 不是瞬间动词嘛不是不能和how long连用的嘛?为什么不选D

B
begin 是瞬间动词,但它不是作主句的谓语动词,而是从句的谓语动词,HOW LONG 可与SINCE 连用呀.SINCE后的时态要用一般过去时.
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How long is it ____ the metting___? How long is the Great Wall?It's about ____ ____ ____ ____ __ How long is it ____ we last spent the holiday in the country How long is it? How long does it ____(walk) to the train station .The river is very long and it is about ____. How long is the Great Wall?It's about( )( ) ( ) how long is it since you went to the seaside? "How long the river is it'怎么用英语翻译 —How long is the bridge?—It's How long is it from the library to his home? 15.Your pen is nice.How long ____ you ____ it?