单项选择题

In the last few years many companies have had no choice but _______ their business.

A．closing
B．close
C．having closed
D．to close
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单项选择题
Just imagine yourself _______ homesick, and what would you do then
A．feel
B．to feel
C．feeling
D．have felt
单项选择题
She found it difficult to concentrate while _______her new novel.
A．write
B．wrote
C．writing
D．was writing
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