单项选择题

-- I bought this computer for $500 last week.
-- It’s on sale this week for only $4,00. You should have waited.
-- Oh, Really But how______I know

A. can
B. will
C. do
D. would
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单项选择题
______ leading Canadian feminist and author, Jackson, struggled relentlessly in ______ early twentieth century to win political and legal rights for ______ Canadian women.
A. A, the, /
B. A, /, the
C. The, /, the
D./, the, /
单项选择题
The pain, which was due to the pressure of the cancer on a nerve, was entirely relieved by the shrinking of the growth, to the extent ______ it caused no further suffering.
A. in which
B. to which
C. at which
D. from which
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