－Why are you looking so worried? Is there anything I can do for you?
－The computer        break down when I nearly finished my composition.
A．can B．should C．must D．dare
C

試題分析：考察情態(tài)動詞辨析。Can可能；should應(yīng)該；must必須，一定，非得，偏偏；dare敢；句意：—為什么你看上去如此擔(dān)憂？我可以為你做什么？—當(dāng)我寫完作文的時候，計算機偏偏在那個時候壞了。根據(jù)句意說明must表示的是偏偏。故C正確。
點評：在平時的學(xué)習(xí)中既要注意情態(tài)動詞的基本含義，也要注意情態(tài)動詞的特殊意義，如must偏偏，非得；should竟然；mustn’t禁止，千萬不能；等等。情態(tài)動詞Shall用于所有人稱，表示命令，警告，允諾；以及法律規(guī)定中要做的事情。
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