關於itp的問題 謝謝 - 英檢

In the United States, a primary election is a method ________voters

select the nominees for public office.

答案是by which

請問為何不能用that


The first known radio program among the United States was broadcast on
^^^^^
Christmas Eve, 1906, by Reginal Fessenden from his experimental station

at Brant Rock, Massachusetts.

請問為何among是錯誤？



多謝解答 謝謝︿︿

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