想請教一下 兩題文法
By the time ________, Thomas had already decided he wished
to be an agriculturist.
1.in his early twenties 2.he was in his early twenties
3.he is early twenties 4.he turns into his early twenties
正確答案是2 請問一下1為何錯誤呢
_______ from its northernmost point at Lake Itasca in Minnesota
to its southernmost point in the Gulf of Mexico, the Mississippi is
about 3710 miles long.
1.Measure 2.Measured 3.Measuring 4.To measure
答案是2
請問為何不能是3
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