Whether and how ________ the meeting hasn't been decided yet.


  1. A.
    to attend
  2. B.
    attend
  3. C.
    attending
  4. D.
    attended
A
解析：
本題考查"疑問(wèn)詞+不定式"結(jié)構(gòu)，在句中作主語(yǔ)。
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C
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B. experiments about why ants have special chemicals on their bodies.

C. experiments about why ants can have this removal behavior

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