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In 1954 Dr. Jonas Salk began______a killed-virus vaccine for polio.A、testedB、ha
In 1954 Dr. Jonas Salk began______a killed-virus vaccine for polio.A、testedB、ha
游客
2024-01-02
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问题
In 1954 Dr. Jonas Salk began______a killed-virus vaccine for polio.
选项
A、tested
B、had tested
C、test
D、testing
答案
D
解析
The verb began needs either an infinitive or a gerund as its direct object; testing is a gerund.
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