－It's important for us to know _________ all the subjects.
－Yeah, group work is my favorite.
| A．how to study | B．when to study |
| C．which to study | D．what to study |
－It's important for us to know _________ all the subjects.
－Yeah, group work is my favorite.
| A．how to study | B．when to study |
| C．which to study | D．what to study |
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