单项选择题

Records show that the federal government is the ______ largest purchaser of the firm's advanced aerospace technologies.

(A) later
(B) single
(C) once
(D) every
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单项选择题
Mr. Aldridge ______ to chair the committee on ethics reform although he has no experience in such a leadership position.
(A) proposed
(B) insisted
(C) advised
(D) supported
单项选择题
The budget committee performed an ______ review of Dr. Garner's grant application and ultimately decided to provide him with full funding.
(A) extending
(B) extension
(C) extensive
(D) extensively
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