有一题：Never mind.you've just caught ___ cold.

a bit of 后接不可数名词,相当于 a little
如： a bit of food = a little food
a bit of milk = a little milk
另外,还要注意这个常用词组：“have a bit of a cold(有点儿感冒)”,“cold（感冒）”虽然是个不可数名词,但习惯上要加a,当然也可以去掉!
因为一般情况下可以互换,但是感冒是a bit of的固定搭配!
参考用