Choose the best answer which can complete the sentence.Please don't touch anything in the school labs ________ you're allowed to.


  1. A.
    if
  2. B.
    unless
  3. C.
    even if
  4. D.
    even though
B
試題辨析
本題考查連詞的使用．根據(jù)題干的含義“你不要?jiǎng)訉?shí)驗(yàn)室的東西，除非允許你動(dòng)”，而if“如果”，even if/though“即使”都不合題意．因此答案為B．
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