It is believed that forest bathing ______ strengthen the immune system.
- A.
should
- B.
must
- C.
need
- 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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