判断句子的一致性使用是否正确：Economics, several courses of which I have taken thus far, proves to be difficult but useful for almost all students.
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判断句子的一致性使用是否正确：The class were divided in opinions.
A. 对
B. 错
判断句子的一致性使用是否正确：More than one teacher gets the flowers.
A. 对
B. 错
Large quantities of water ____every day here while it is in great need in some faraway area.
A. are being wasted
B. is wasted
C. have been wasted
D. was wasted
The writer and actor ____ invited to give us a report yesterday.
A. are
B. have been
C. was
D. were
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