若线性方程组有无穷多解,则a=()。
A.1或4
B.1或-4
C.-1或4
D.-1或-4
参考答案:C
The Japanese government on Wednesday urged people_______ 11 types of vegetables _______Near the quake-hit Fukushima Daiichi nuclear power plant in Northeast Japan .
A.mustn’t eat ,growing
B.not to eat, growing
C.not to eat ,grown
D.couldn’t eat ,grown
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