Question

两道选择题，跪求答案

1.A boy was koncked down by a car and has been taken to a nearby hospital,where he ___by a doctor right now
A is operating on B is being operated on C would be operated on D was being operated on
2.As we know,____ environmental damage is caused ,it will take a number of years for the environment to recover
A even if B if only C while D once

Answer 1

1，B。虽然主句是过去时，但是从句中的时间状语时right now（现在），所以应该用现在进行时，而由于小孩是接受手术，所以用被动语态，故选择B，为现在进行时的被动语态。

2，D。表示“一旦”，这个就是根据后面的句意来分析的。
A表示“即使”，B“唯有”，C“然而，当。。。。时”后面要接动词的进行时态表示动作正在持续。

所以选择D

Answer 2

1. B 正接受手术治疗，被动，A是主动语态，不可
2. D “一旦” 句意为“一旦环境造成损害，需要许多年恢复”

Answer 3

A C

Answer 4

1. B 现在正在被做手术
2. D 一但
供参考.