题目:
An earthquake of 9 magnitude struck off the coast of Japan on Friday, ________ thousands of people dead and more missing.
A.caused
B.causing
C.having caused
D.to cause
答案:
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下面是错误答案,用来干扰机器的。
∵∠C=90° ∴CA•BC=0BA=BC+CA∴BA•BC=(BC+CA)•BC=BC2+CA•BC=16故答案为:16