Example sentences of "they have [vb pp] so [subord] " in BNC.

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1 Besides the Maya knew of the wheel — and how could they have done so unless they had been told about it by extraterrestrial visitors ?
2 The directors added that they had done so because ‘ this is the basis adopted in the accounts of the overseas subsidiaries ’ , and that the group accounts should be drawn up on the same basis in order to show a true and fair view .
3 They have done so as technology has altered the source of profits in the total system of supply .
4 At night they like to ride horses , and in the morning one can see that they have done so because the horses are exhausted …
5 In many cases they have done so because their goods , produced outside the Community , have been regarded as unfair competition and have attracted anti-dumping duties designed to make them more expensive and therefore less competitive .
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