To do their jobs well ,police officers must be very _________.
(1)observing
(2)observant
(3)observation
(4)to observe
書上的解答是
To do their jobs well ,police officers must be very observant.
不過我在想,能否選(1)observing???
"To do their jobs well ,police officers must be very observing"
我的想法是,這兩個選項都能當形容詞"觀察力敏銳的"
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