You _______ see a dentist when you have a toothache. 
A．mayB．needC．shouldD．can
C
情態(tài)動(dòng)詞辨析。 may    可以；need  需要；should 應(yīng)該；can可能，能。句意：當(dāng)你牙疼時(shí)，你應(yīng)該去看牙醫(yī)。故選C。
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