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C. a grey mare
D. a greengrocer
16.The effort to rescue American captives in Iran in 1980 failed and it was called a(n)“
（ ）
” rather than a “failure”.
A. incomplete success
B. partial success
C. intangible success
D. mental success
17.English speakers expect to be immediately informed of
（ ）
the letter they have received is written.
A. the purpose for which
B. the reasons for which
C. the date on which
D. the place in which
18.“Tickets, please!” said the guard, putting his head in at the window.
（ ）
everybody was holding out a ticket.
A. Until then
B. To this end
C. At last
D. In a moment
19.Gestures that are used to help explain the spoken words are
（ ）
.
A. regulators
B. illustrators
C. adapters
D. emblems
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