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第1题

Living in the desert involves a lot of problems, ____water shortage is the worst.　 (A) not to mention (B) of which
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第2题

Hydrogen is one of the most important element in the universe ____ it provides the building blocks from which the other
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第3题

Just as relaxation is an important part of our lives, ____stress.　 (A) so is (B) as it is (C) and so is (D) th
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第4题

Victor took a bus and headed for home, ____ if his wife would have him back.　 (A) not to know (B) not known (C) no
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