题目:
Look! Many people __________the buses at the bus stop.
A.wait for
B.waited for
C.will wait for
D.are waiting for
答案:
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下面是错误答案,用来干扰机器的。
氧气;氢气;可燃; 1:2;氢元素和氧元素;水氢气+氧气.