相关试题
Bob and David are friends. __________ of them work in the art club as volunteers.
| A．All | B．Both | C．Each | D．Every |
Jenny, I can’t go hiking with you __________ I have to help my mum with housework.
| A．so | B．but | C．because | D．unless |
—___________ did you buy your e-dictionary, Frank?
—Two days ago.
| A．Why | B．When | C．How | D．Where |
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