问题补充:
a certain doubt among the people as to the practical value of the project.
A. It has
B. They have
C. It remains
D. There remains
答案:
A. It has
B. They have
C. It remains
(答案→)D. There remains
解析:句意:关于那个工程的实用价值,人们还是心存某种疑虑。there remains...意为“仍有……”,为there be句型的变体。名词doubt往往与there be句型及其变体连用构成固定句型。