TOEFL Grammar - Choose the right word

ScottsEnglishScottsEnglish Administrator Posts: 1,301 admin ✭✭✭✭✭✭✭
in TOEFL Test
____________________ antibiotics are useful in killing many strains of bacteria, viruses continue to be resistant to these same

antibiotics.

a. Unless
b. While
c. Until
d. Nevertheless

Spoiler
The correct answer is b, "while" .


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