分析 這個婦女一天刷兩次牙來預(yù)防疾。
解答 答案:brushes.一般現(xiàn)在時表示經(jīng)常性,習(xí)慣性,永久性的動作或存在的狀態(tài).通常與副詞sometimes,often,usually,always,every day (year,month ),once (twice,three times) a day,等時間狀語連用.根據(jù)"twice a day"所有這個句子要用一般現(xiàn)在時來填空,故填brushes.
點(diǎn)評 首先要掌握一般現(xiàn)在時的用法,還要掌握這個詞的形式,然后結(jié)合具體的題目,就可以確定正確答案.
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