Mô tả chung
Choose a, b, c, or d that best completes each unfinished sentence, substitutes the underlined part, or has a close meaning to the original one.
Choose a, b, c, or d that best completes each unfinished sentence, substitutes the underlined part, or has a close meaning to the original one.
Question 27: Up to now, ______ space exploring still remains _____ very risky, complex, and expensive endeavor.
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câu trả lời
