|
．
between
17
．
The farmers _______ in the field since eight o’clock in the morning.
A
．
have been working
B
．
are working
C
．
had worked
D
．
were working
18
．
It was _______ that there was nobody on the street.
A
．
so cold day
B
．
such a cold day
C
．
a day so cold
D
．
such cold day
19
．
He had no sooner seen the letter _______ he started back home.
A
．
when
B
．
while
C
．
than
D
．
that
20
．
By the end of last year, he _______ English for seven years.
A
．
has studied
B
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