Bunuel wrote:
While a growing number of mothers in developed countries undergo childbirth at home, some physicians
have still recommended that labor take place in a hospital.
A. have still recommended
B. had still recommended
C. still recommended
D. are recommending
E. still recommend
OFFICIAL EXPLANATION
While a growing number of mothers in developed countries undergo childbirth at home, some physicians have still recommended that labor take place in a hospital.A. have still recommended
Incorrect.
This answer choice is grammatically incorrect. The first verb in this sentence, undergo, is in the Present Simple, because it describes a frequent event or generalization. The second verb should logically continue in this tense. However, have still recommended is in Present Perfect.
Since this question compares one group of people - mothers - with another group of people - physicians, both actions (undergo, recommended) should logically be described in the same tense, especially as there is no indication that a different tense should be used. B. had still recommended
Incorrect.
This answer choice is grammatically incorrect and repeats the original mistake. The first verb in this sentence undergo, is in the Present Simple, because it describes a frequent event or generalization. The second verb should logically continue in this tense. However, had still recommended is in Past Perfect. C. still recommended
Incorrect.
This answer choice is grammatically incorrect and repeats the original mistake. The first verb in this sentence undergo, uses Present Simple to describes a frequent event or generalization. The second verb should logically continue in this tense. However, recommended is in Past Simple.D. are recommending
Incorrect.
This answer choice is grammatically incorrect and repeats the original mistake. The first verb in this sentence undergo, is in the Present Simple, as it describes a frequent event or generalization. The second verb should logically continue in this tense. However, are recommending is in the Present Progressive tense.E. still recommend
Since the actions denoted by the verbs undergo (Present Simple) and have (still recommended) (Present Perfect) are compared in this sentence, these verbs should be in the same tense.
Changing the verb to the Present Simple completes the comparison - although mothers undergo a certain procedure, doctors recommend another.