Keep up good state of mind even if you _____ fail plenty of times.
A．mustB．willC．canD．should
D
考查should的又一用法，should用在if或even if引導(dǎo)的表示條件的從句中，表示一件事聽起來可能性很小，但也不是完全沒有可能，相當(dāng)于“萬一”的意思，從句謂語由should加動(dòng)詞原形構(gòu)成，主句不一定用虛擬語氣，如：
Please ring me up if you should change your mind. 萬一你改變主意，請(qǐng)讓給我打個(gè)電話。
Should I (If I should) be free tomorrow, I will come. 萬一我明天有時(shí)間，我就來。
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