单项选择题

To get a necessary reference letter for the scholarship, students must contact ______ high schools in advance.

(A) they
(B) them
(C) their
(D) theirs
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单项选择题
In some countries, home prices have a tendency to soar ______ as interest rates began to drop.
(A) efficiently
(B) strictly
(C) productively
(D) dramatically
单项选择题
Recently, the price of crude oil affecting each country' s economy ______ moderately.
(A) to rise
(B) risen
(C) rises
(D) rose
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