It is believed that forest bathing ______ strengthen the immune system.
A．shouldB．mustC．needD．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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