这句话用英语怎么说？

Question

那个男孩假装正在认真工作。

Answer 1

The boy pretended to be working hard.

Answer 2

That boy is pretending to work very hard.

Answer 3

The boy pretends to be concentrating on work.

Answer 4

The boy is pretend to study hard.

Answer 5

That boy pretends to be working conscientiously.
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