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The police warned people to be ___ guard against pickpockets during the Christmas rush.
a.up b. at c,in d. on
为什么选C，这句句子应该怎么解释
While in London , we paid a visit to the hospital founded ___ the nurse Florence Nightingale.
a. instead of b. in honour of c. in favour of d. in place of
为什么选b
The old man is ___ the habit of going for a walk along the river every morning ____ rains.
a. with except b. in but c. in unless d. with but
为什么这里用in
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