题目内容

按研究方法的适用范围和概括程度，教育科研方法可以分为______方法、_方法和_______方法

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Our payment terms （付款方式）are ___ , irrevocable letter of credit for the full invoice value.（）

A. con firmed
B. combi ned(联合)
C. committed
D. completed

教育研究与其他科学研究一样，由_________、_和_________三个基本要素组成

We are looking forward to ___ your L/C for Order No 123.（）

A. receive
B. receiveing
C. be received
D. be receiving

_______ for a long time, most of the crops in this area died from lacking water.

A. Being no rain
B. There was no rain
C. To be no rain
D. There being no rain