题目内容
They are ________ the different kinds of animals now.
[ ]
A.
learning
B.
studying
C.
to learn
D.
to study
答案:B
解析:
解析:
|
可解释为“研究”。 |
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题目内容
They are ________ the different kinds of animals now.
learning
studying
to learn
to study
|
可解释为“研究”。 |