The twins ____ Chinese when they were eleven.A.may tell B.can speak C.must say D.could speak选哪个 为什么 重点是为什么

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The twins ____ Chinese when they were eleven.A.may tell B.can speak C.must say D.could speak选哪个 为什么 重点是为什么
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The twins ____ Chinese when they were eleven.A.may tell B.can speak C.must say D.could speak选哪个 为什么 重点是为什么
The twins ____ Chinese when they were eleven.
A.may tell B.can speak C.must say D.could speak
选哪个 为什么 重点是为什么

The twins ____ Chinese when they were eleven.A.may tell B.can speak C.must say D.could speak选哪个 为什么 重点是为什么
D
when引导的是时间状语从句,他们11岁时(过去的时间),因此主句也要用过去时,表示在过去的时间做的动作,这里四个选项只有could是can的过去式