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166. I think your bookshelf is too high. I can’t reach a book on top even when I _____ my hand.

166. I think your bookshelf is too high. I can’t reach a book on top even when I _____ my hand.

A. hold back                 B. hold on                    C. hold out                   D. hold up

166. I think your bookshelf is too high. I can’t reach a book on top even when I _____ my hand.