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[問題] 練習題的疑惑

[問題] 練習題的疑惑

練習題的疑惑
做練習題時有幾題不確定的 想請教一下

1. ___ we concede that the union does have a point, it is impossible for us to meet

the members' demands.

A) During  B)Having  C)While   D)As

答案是給c    但為什麼d不行呢??  而且這句話中point到底要解釋成什麼比較好呢???

2. Most of the departments will be ___ office parties before the Christmas vacation

begins.

A)held  B)have held   C)holding

答案是c    但是我不懂??

3. The new staff break room will be located on the second floor, __ the vending

machines.

A)opposite     B)against

答案是a 不過想請問一下b行嗎??

4. As that is only three days __, I'd really like to meet up and talk with you

beforehand.

A)ago    B)away

答案是b    那想請問一下這句要怎麼解釋比較好???

感謝大家的解答~~
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