单项选择题

I didn’t answer the phone ______ I didn’t hear it ring.

A. if
B. unless
C. although
D. because
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单项选择题
The children looked up as the planes passed ______.
A. overall
B. overhead
C. outward
D. forward
单项选择题
The monitor ______ the examination papers to the class for his teacher.
A. delivered
B. distributed
C. reported
D. presented
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