单项选择题

How long do you suggest is it ______ he arrived there

A．when
B．before
C．after
D．since
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单项选择题
Jenny ______ have kept her word. I wonder why she changed her mind.
A．must
B．should
C．need
D．would
单项选择题
Zhang Hong is said ______ by heart 2000 words up to now.
A．that she has learned
B．to have learned
C．to learn
D．having learned
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