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【单选题】
.Xinyu, a city dubbed as “a pearl in western Jiangxi province”, was struck by a heavy rain last week, ________ serious traffic problems.A.
to face
B.
faced
C.
facing
D.
having faced
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【简答题】Believe it or not, when first (introduce) ______ to Europe, tomato was thought to be poisonous.
【单选题】When first ________ to the market, the computer software ． was not a success due to its complexity in operation.
A.
introducing
B.
being introduced
C.
introduced
D.
to be introduced
【简答题】在饼层过滤中，真正发挥拦截颗粒作用的主要是( )而不是( )。