单项选择题

— Do you know what Tom does all day —I know he spends at least as much time watching TV as he ______ his lessons.

A．is doing
B．does
C．spends in
D．does doing
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单项选择题
Some people believe that Mars (火星) could support ______life in the future if ______ right conditions were produced.
A．the; the
B．不填; 不填
C．不填; the
D．the; 不填
单项选择题
I like to have my bed ______clean and tidy.
A．look
B．looking
C．to look
D．looked
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