The scientist ________ (die) in 2015. He ________ (be) ill since 2012.
A. died; was
B. had died; was
C. died; had been
D. had died; had been
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土钉墙是以土钉作为重要受力构件，由被加固的原位土体中密集的土钉群、附着于坡面的混凝土面层和必要的防水系统组成，形成一个类似重力式的挡土墙的支护结构。
A. 对
B. 错
地下连续灌注桩的构造要求，顶部不设钢筋混凝土冠梁。
A. 对
B. 错
Teachers’ Day falls on September 9th in China.
A. True.
B. False
“Teaching students with differently based on their aptitude.” means “因材施教” in Chinese.
A. True.
B. False
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