单项选择题

There is no doubt ______ the couple did the right thing in coming back home earlier than planned.

A. whether
B. that
C. why
D. when
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单项选择题
Look at those pretty girls' skirts is ______, because it is not clear whether the girls or the skirts are pretty .
A. ambiguous
B. hidden
C. indirect
D. indistinct
单项选择题
The girl's voice was so low that we could ______ hear her.
A. seldom
B. almost
C. only
D. barely
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