题目内容
（请给出正确答案）
They ______ more enthusiastic about their work since their teacher's return.
A．are
B．were
C．had been
D．have been
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A.一级
B.二级
C.三级
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A．result from
B．result on
C．result in
D．result for
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A: more carefully
B: the most carefully
C: more careful
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