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题型：单选题题类：模拟题难易度：普通

Some of my friends are interested in science, but none of them can tell ____________.

A、when UFOs appear next time B、if horses know the way or not C、where was this kind of plant found D、how elephants communicate

举一反三

—What ________ he say to you just now?
—He told me that he ________ his key in the room.

—What did the teacher say before the class was over, Julia?

—He asked us ____.

你能告诉我该乘哪路公共汽车吗?

— Karl Marx is a great thinker. Do you know______.

— In 1818.

The teacher asked, "Has she read enough this week?"

The teacher asked ________ read enough ________ week.

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