Although Fleming discovered Penicillin, it was over a decade ______ someone else turned it into the great drug of the 20th century.

Although Fleming discovered Penicillin, it was over a decade ______ someone else turned it into the great drug of the 20th century.

#92265

before

since

when

推荐题目

—Did Peter fix the computer himself?—He _______,because he doesn’t know much about computers.

#94672

has it fixed

had fixed it

had it fixed

fixed it

Mrs. Brown was much disappointed to see the washing machine she had _____ went wrong again.

#94959

it repaired

to be repaired

to repair

repaired

Rather than _________ on a crowded bus, he always prefers _________ a bicycle.

#92690

ride; ride

riding; ride

ride; to ride

to ride; riding

There are some police cars in front. What do you suppose ____?

#94768

is the matter

is happened

is the wrong

the trouble is

It was the first time that I __________ the night face to face.

#92300

had seen

have seen

see

seeing

共1873题