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Be careful with such things. If you _____, you’ll drop them.
A．don’tB．aren’tC．won’tD．do
B
選B。本題考查學生運用省略語法的做題能力。完整的句子為：If you aren’t (careful)，you’ll drop them. 另外，條件狀語從句用現在時表將來，所以排除了won’t。
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