Mountain climbing ______ be really dangerous at times even though it is challenging and exciting in general.
A．canB．shouldC．shallD．must
A

試題分析：在平時的學習中既要注意情態(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。情態(tài)動詞can能夠，可能；should應(yīng)該；shall將要；must一定，必須；本句考察的是情態(tài)動詞can的一個特殊用法“有時候會…”；句義：即使登山總的說來很有挑戰(zhàn)性也很讓人興奮，但是有時候它也很危險。故A正確。
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