It remains to be seen _______the newly formed committee’s policy can be put into practice.
A．thatB．whichC．whatD．whether
D

試題分析：考查主語從句。句意：是否新形成的委員會的政策能付諸實施還有待證實。題干中it作形式主語，真正主語為橫線后的主語從句。判斷主語從句中不缺少主干成分，因此排除代詞BC兩項；“有待被觀察”的事情應是不確定的事而不是表陳述，即排除表陳述的that應用whether表“是否”。選D。
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