问题
选择题
-- -- Efron, the biggest teen star in America right now,is travelling around the world ____ the third High School Musical film .
----It must be well received.
A．promote
B．promoting
C．promoted
D．being promoted
答案
答案：B
考查非谓语动词。这里动词的现分形式作状语。
金属熔附烤瓷冠
金属冠焊接中，对焊接面的要求哪项是错误的（）