It is believed that forest bathing ______ strengthen the immune system.


  1. A.
    should
  2. B.
    must
  3. C.
    need
  4. D.
    can
D
考查情態(tài)動(dòng)詞。A應(yīng)該；B必須；C需要；D能夠，可能；句意：人們認(rèn)為深林浴能加強(qiáng)免疫系統(tǒng)。
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