疑问词引导

　　eg. In the 1840s， Maury had been responsible for encouraging voyages during which soundings were taken to investigate the depths of North Atlantic and Pacific Oceans.

　　The problem then arises as to the point at which one can say that these imitations can be considered as speech.

　　同时出现that和疑问词的句子

　　eg. A reporter who has visited plants throughout Europe has an impression that the pace of work is much slower here.

　　Then she writes a care plan centered on the patients illness but which also includes everything else that is necessary.

　　（3） 状语从句

　　eg. Much family quarrelling ends when husbands and wives realize what these energy cycles mean， and which cycle each member of the family has.（时间）

　　But in actual practice this system breaks down in many ways， because the organism and the environment are constantly interacting so that the environment is modified by the organism and vice versa.（原因）

　　A breakthrough in the provision of energy from the sun for the European Economic Community could be brought forward by up to two decades， if a modest increase could be provided in the EECs research effort in this field， according to the senior EEC scientists engaged in experiments in solar energy at EECs scientific laboratories at Ispra， near Milan.（条件）

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