If you _____ leave early on weekdays, do it quietly. The other classmates are also dying to have an early leave.
A．canB．mustC．shouldD．may
B

試題分析：句意：如果你在周內(nèi)硬要早離開(kāi)的時(shí)候，請(qǐng)悄悄的，其他的學(xué)生也渴望能早點(diǎn)離開(kāi)。must此處在這里表示一種感情色彩，意為“偏要，硬要”，故選B
點(diǎn)評(píng)：情態(tài)動(dòng)詞中除了表示推測(cè)，基本意思以外，還可以表示一種感情色彩，如must表示偏要，一種責(zé)備的語(yǔ)氣，而should表示一種非常驚訝的語(yǔ)氣，意為“竟然”，在if的條件狀語(yǔ)從句中還可以表示“萬(wàn)一”。
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