are running
整句話的意思是:要數(shù)清猴子的數(shù)量是很難的因?yàn)樗鼈円恢迸軄砼苋?
for的意思是:因?yàn)?由于
由這句話的題干來看應(yīng)該用現(xiàn)在進(jìn)行時(shí).
It's hard to count the monkeys for they_______(run)all the time.
It's hard to count the monkeys for they_______(run)all the time.
英語人氣：207 ℃時(shí)間：2020-01-25 17:38:31
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