单项选择题

______, electrons are still smaller.

A. As atoms small are
B. As atoms smaller as
C. Small as atoms are
D. Smaller atoms as are
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The fact remains ______ we are behind many others.
A. that
B. why
C. where
D. how
单项选择题
Tom looks so pale today. He ______ ill.
A. must be
B. had to be
C. should be
D. shall be
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