[ Past Perfect Simple & Past Perfect Continuous ]
We use had been + the -ing of the main verb to form the past perfect continuous.
A. TRUE
B. FALSE
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Grammar › ViewDr. Keyssar’s new book offers encouragement ______ those hoping ______ produce change ______ the twenty-first century.
A. for, to, with
B. to, to, in
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A. in
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C. for
D. on
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