It is rather ______ that we still do not know how many species there are in the world today.
| A．misleading | B．embarrassing | C．boring | D．demanding |
相关试题
— I wonder ________ you’ll water this kind of flower. 
——Every other day.
| A．how often | B．how long | C．how soon | D．how much |
________ many times, he finally understood it.
| A．Told | B．Telling | C．Having told | D．Having been told |
As a new diplomat, he often thinks of_____- he can react more appropriately on such occasions.
| A．what | B．which | C．that | D．how |
—Would you please help me with the box? 
—_________
| A．Yes, please | B．No, please don’t | C．With pleasure | D．My pleasure |
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