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从A、B、C和D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
例：It is generally considered unwise to give a child ____ he or she wants.
A. however B. whatever C. whichever D. whenever
答案是B。
21. ______ Flying Luxury Hotel of Tomorrow is ______ huge 400-ton aircraft without wings.
A. /, a B. The, a C. The, the D. A, a
例：It is generally considered unwise to give a child ____ he or she wants.
A. however B. whatever C. whichever D. whenever
答案是B。
21. ______ Flying Luxury Hotel of Tomorrow is ______ huge 400-ton aircraft without wings.
A. /, a B. The, a C. The, the D. A, a
