问题：
[单选题]We all know that learning a foreign language _______ time and effort.( )
A、requires
B、reduces
C、removes
D、repeats
参考答案：
A
相关内容
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- ● 设a=5，b=4，c=3，d=2下列表达式的值是 3＞2*b Or a=c And b＜＞C Or c＞d
- ● 设a=5，b=4，c=3，d=2，下列表达式的值是 3＞2*b Or a=c And b＜＞c Or c＞d
