单项选择题

His teacher demanded that his homework ______ on time.
A) is handed in C) were handed in
B) was handed in D) be; handed in
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单项选择题
______ Cathy lives is unknown to everyone. A) That C) Which B) What D) Where
______ Cathy lives is unknown to everyone.
A) That C) Which
B) What D) Where
单项选择题
The workers ______ a library for our university this month. A) are building C) built B) build D) had built
The workers ______ a library for our university this month.
A) are building C) built
B) build D) had built
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