_____ is necessary for us to finish the work in two days.
| A．They | B．This | C．It | D．That |
相关试题
— Lily, look at the flowers in the garden.
— Wow, _______ beautiful they are!
| A．What a | B．What | C．How | D．How a |
Liza speaks English very well，_______she doesn’t know Chinese.
| A．and | B．so | C．but | D．Because |
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