In 21st century, scientists continue to look for new ways ...

★ Word Form & Verb Tense

In 21st century, scientists continue to look for new ways _____ serious disease and slow down the ageing process

A. to treat

B. treat

C. treatment

D. treated

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After he _____ his English course, he went to England to continue his study

A. has finish

B. had finished

C. was finished

D. would finish