He ____ much of his time in learning the new language.
He ____ much of his time in learning the new language.
A、invested
B、involved
C、invented
D、integrated
【正确答案】：A
【题目解析】：他在学习新语言中投入了大量的时间。A投资，花费B涉及；使参与；包含C发明；虚构D使…完整；使…成整体；求…的积分；表示…的总和
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