The doctor said jokingly that his own infection of the virus _______ the discovery of a vaccine (疫苗)of the disease.
#76217
A
stood for
B
called for
C
paid for
D
contributed to
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Mr.Morse，who graduated from a famous medical university，spent years ______ his skills as a doctor.
#82500
A
adapting
B
acquiring
C
occupying
D
concentrating
Though there are many beautiful dresses in the shop, yet none could ________ her.
#82821
A
suit
B
go with
C
match
D
meet
—Why didn’t you give back Robert’s e-dictionary yesterday?—I forgot ______ it here, but I mean ______ it to him tomorrow.
#65279
A
to bring; to return
B
to bring; returning
C
bringing; to return
D
bringing; returning