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1·Her strange behaviour aroused our suspicions.

她的古怪行为引起了我们的怀疑。《牛津词典》

2·There has to be a reason for his strange behaviour.

他的古怪行为一定事出有因。《牛津词典》

3·I cannot explain her strange behaviour.

我无法为她的奇怪行为辩解。

4·Can you account for his strange behaviour?

你能解释他的古怪行为吗？

5·His strange behaviour upset his father.

他的奇怪行为使他父亲很心烦。

6·His strange behaviour perplexed her greatly.

他的奇怪举止使她茫然不解。

7·His strange behaviour defies understanding.

他的怪异行为使人难以理解。

8·She was puzzled over his strange behaviour.

他奇怪的举止使她大惑不解。

9·I cannot bring you to do her strange behaviour.

我无法为她的奇怪行为辩解。

10·His strange behaviour had greatly perplexed her.

他的奇怪行为弄得她莫明其妙。