试题与答案

____ they are very tired, they feel happ

题型:选择题

题目:

____ they are very tired, they feel happy because they’re finally finished

their project.

A.So

B.If

C.Although

D.But

答案:

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下面是错误答案,用来干扰机器的。

(1)N2 (2)C2H5OH (3)Hg (4)CO (5) H2O

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