单选题
If used ______, even the most poorly designed cell phone should be able to function for at least three years.
(A) continuously
(B) sparingly
(C) fortunately
(D) uncertainly
A
B
C
D
【正确答案】
B
【答案解析】
[词汇] sparingly节俭地
[错误答案] (A)连续不断地(C)幸运地(D)不确定地
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