In 1778, Bank was elected _________ president of the Royal Society, ________ position he held for 43 years.
#9127
A
the; the
B
不填; a
C
a; a
D
不填 ; the
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The development of industry has been_______ gradual process throughout _______ human existence, from stone tools to modern technology.
#9174
A
不填, the
B
the; a
C
a; 不填
D
a; a
Generally speaking, in the United States ____ 15-percent tip is normal for ____ most restaurants.
#10237
A
a; /
B
an; the
C
/; a
D
/; the
John, _______ university professor, is considered to be _______ success as ______ expert in the agriculture research.
#9081
A
a; a; an
B
an; / ; an
C
the; /; an
D
a; the; an