Bacteria are sometimes ______ too small to be seen without a microscope.

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问题 Bacteria are sometimes ______ too small to be seen without a microscope.

选项 A、far
B、rather
C、quite
D、very

答案A

解析 一般用far,much,all来修饰too,表示“太……”的意思。所以选项A符合题意,为正确答案。
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