they are ____koocking at the back doorthey are ____koocking at the back door(尝试)

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theyare____koockingatthebackdoortheyare____koockingatthebackdoor(尝试)theyare____koockingatthebackdoor

they are ____koocking at the back doorthey are ____koocking at the back door(尝试)
they are ____koocking at the back door
they are ____koocking at the back door(尝试)

they are ____koocking at the back doorthey are ____koocking at the back door(尝试)
他们在后门____koocking

trying
尝试

答案:trying ( 短语try doing sth 尝试做某事,try to do sth 努力做某事 )

trying ( 短语try doing sth 尝试做某事,try to do sth 努力做某事 )