英文形容詞有疑問

The doctor advised her to eat more ____ food. (a)honest (b)healthful (c)healthy (d)helpless healthy也是形容詞為什麼不能選???? Controlling air pollution is important objective. Without food, man can live about five weeks; without water about five days. Without air, he can only live five minutes, so pure air... show more The doctor advised her to eat more ____ food.
(a)honest (b)healthful (c)healthy (d)helpless
healthy也是形容詞為什麼不能選????

Controlling air pollution is important objective. Without food, man can live about five weeks; without water about five days. Without air, he
can only live five minutes, so pure air is (a must.) Here the wrongdoer
__1__ the automobile. Where (there is) a concentration of automobiles,
__2__ in our big cities, air pollution is serious. It is necessary to have our cars __3__ with pollution-control devices.

為什麼 must要加a什麼意思?

there is 可以用have或 has 嗎?

1.(a)has (b)have (c)is
2.(a)as (b)which (c)when
3.(a)equip (b)equip (c)equipping (d)equipment
Update: 1.(a)has (b)have (c)is為什麼是is

2.(a)as (b)which (c)when 為什麼不能選關代which

3.(a)equip (b)equipped (c)equipping (d)equipment為什麼是equipped
1 answer 1