单项选择题

Doctors see a connection between increase amounts of leisure time spent______ and the increased number of cases of skin cancer.

A．to sunbathe
B．to have sunbathed
C．having sunbathed
D．sunbathing
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单项选择题
When preparing elementary school test, care should be taken______.
A．not to make the vocabulary more difficult than necessary
B．not to make the vocabulary that difficult
C．so as to not make the vocabulary part too hard
D．in not making the vocabulary a problem in terms of it difficulty
单项选择题
For centuries, until the first Americans reached the moon, men speculated as to______.
A．What looked like the satellite' s other side
B．what the satellite' s other side looks like
C．what did the satellite' s other side look like
D．what the satellite' s other side looks like
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