[ Conjunction ]
_____ he knew the answer, he would not tell us.
A. until
B. since
C. although

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A. invest
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Relative Clause › View
I have to learn new words. They are very difficult.
A. I have to learn new words that are very difficult.
B. I have to learn new words that they are very difficult.
C. I have to learn new words who are very difficult.
D. I have to learn new words whom are very difficult.