单项选择题

But as a matter of fact, I did not begin to work ______ he had gone.
A) until C) although
B) since D) if

A．But as a matter of fact, I did not begin to work ______ he had gone.
B．until
C．since
D．although
E．if
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单项选择题
Babies sleep much longer than adults each day because ______.
A．they have nothing else to do day and night
B．they need sleep to help develop brains and bodies
C．adults find it difficult to fall asleep at night
D．adults have quite a lot of things to do during the day
单项选择题
Without enough sleep, people would be ______. A) in poor health C) physically energetic B) in good health D) mentally energetic
A．Without enough sleep, people would be ______.
B．in poor health
C．in good health
D．physically energetic
E．mentally energetic
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