1、John became a football coach in Sealion Middle Schol ____ the beginning of March

1、John became a football coach in Sealion Middle Schol ____ the beginning of March
A on B for C with D at
为什么不是D呢）
2、 No progress was made in the trade talk as neither side would accept the conditions of _____
A others B the other C either D another
为什么不是B）
3、_____ into use in April 2000,the hotline was meant for residents reporting water ande heating supply breakdowns
A put B putting C having put D being put
为什么不是D）
4、Never before ____ in greater need of modern public transport than it is today
A has this city been B this city has been C was this city D this city was
为什么不选C）