问题

So absorbedin theexperiment that he didn’t even notice it was already over 12 o’clock

A:which
B:since
C:because of
D:because

正确答案是：

同类题型

He ___________ some nice gifts __________ his mother for her birthday last Sunday

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When asked to explain _____ he does to make his students so fascinated with his lessons, the teacher paused and thought deeply. [ ]