31. They demanded that the books __to the school library at once.
| A．return | B．should return | C．be returned | D．would be returned |
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It rained for several weeks, completely ____ our holiday．
| A．ruined | B．ruining | C．to ruin | D．ruin |
Xiamen Xiang'an Tunnel, _____ is the first undersea tu
nnel built in mainland China, opened to traffic on April 26th．
| A．that | B．what | C．where | D．which |
A survey of the opinions of experts ____ that drinking a glass of hot milk before going to bed helps one sleep well．
| A．shows | B．show | C．is showing | D．have shown |
—Which of the two iPods do you prefer?
—To te
ll you the truth, I don't like _____ of them．
| A．both | B．either | C．none | D．neither |
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