However, no one ________ any life in space yet.


  1. A.
    has been discovered
  2. B.
    discovered
  3. C.
    has discovered
  4. D.
    have discovered
C
點撥:此題考查no one在現(xiàn)在完成時態(tài)中作主語時,助動詞應(yīng)該用has,選項B和D不符合這一用法,A項是被動語態(tài),只可選C。
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任務(wù)型閱讀(本題共10分,每空1分)

先閱讀(A)、(B )兩篇短文,然后根據(jù)題目要求及所給語境完成下列四項任務(wù)。

(A)

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(B)

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