【題目】He _______(breath) deeply to keep calm when he is in need.

【答案】breathes

【解析】句意：他在需要時深呼吸以保持鎮(zhèn)靜。此處是when引導(dǎo)的時間狀語從句，從句用的是一般現(xiàn)在時態(tài)，根據(jù)句意可知主句也用一般現(xiàn)在時態(tài)，He是主語，故填breathes。

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