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bacoon

1.        During the Renaissance, scholars were uncertain as to the location of Troy, and by the eighteenth century many historians doubted that Troy had ever existed.

(A) doubted that Troy had ever existed

(B) doubt that Troy has ever existed

(C) were in doubt as to the existence of Troy

(D) were doubtful concerning Troy’s existence（A）

(E) had doubts about Troy’s ever existing

不是说doubt后不能加that,只有no doubt才能加that吗?

Zeldaw

在及其少数的情况下，doubt后that  表示极度怀疑