单项选择题

The boss won't give the workers pay unless they _______ their work today.

A．will finish
B．had finished
C．finish
D．finished
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单项选择题
The boy looked at the stranger carefully, _________ who he could be.
A．wondering
B．having wondered
C．to wonder
D．wondered
单项选择题
“Why didn't you use that printer” “Because it wasn't ________ to fit it.”
A．enough good
B．good as enough
C．as enough good
D．good enough
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