---Sorry, I’m late for class again.---Is it ______ you stayed up last night?
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A
why
B
how
C
because
D
when
推荐题目
 Which of the following is RIGHT? 
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A
In the early 19th century, the first trains began to carry passenger.
B
Dinosaurs lived on Earth more than 60 millions years before human beings.
C
The king ordered his men to collect a bag of rice.
D
There are many tiny computers around us, and we dependent on them nearly every day.