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［答案］D.
［析］这里的真正主语应为不定式to walk on the moon.而形式主语只能用it.
38 Jane has sent several letters, but ＿＿＿of them have been answered.
A all B both C either D none? ［答案］D.
［析］several letters意为“若干信件”，应看作多于两者，则在A、D中作选择，仅D符合句意。 39 I don't know ＿＿＿about the new headmaster. A something B everything C nothing D anything?
［答案］D.
［析］否定句中应用anything.
40＿＿＿ of the students in the whole class could do this physics question.
A No B None C Not D Neither? ［答案］B.
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