Thay____ when i came into the chassroom?A.are readingB.were readingC.was readingD.read为什么不选A或C啊?

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Thay____ when i came into the chassroom?A.are readingB.were readingC.was readingD.read为什么不选A或C啊?

Thay____ when i came into the chassroom?A.are readingB.were readingC.was readingD.read为什么不选A或C啊?
Thay____ when i came into the chassroom?
A.are reading
B.were reading
C.was reading
D.read
为什么不选A或C啊?

Thay____ when i came into the chassroom?A.are readingB.were readingC.was readingD.read为什么不选A或C啊?
B.were reading
过去进行
我进教室的时候他们正在阅读
补充
A现在进行
C谓语单数
都不是正确的

B

B
两个动作同时进行;短的用一般过去时;长的用法过去进行时

B

B
when 表示进行时,可是后半句的came是come的过去式,前后句需统一,助动词 也必须是过去式,A就不能选了。而they表示复数,所以选B而不是C