单项选择题

() explain it to him, he still didn't understand.

A. Hard as I tried to
B. As I tried hard to
C. Hard I tried to
D. Tried as I hard to

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单项选择题
Only when you have a good knowledge of grammar () write correctly.

A. you will
B. you can
C. can you
D. can't you
单项选择题
When () with a strong enemy, they had always retreated.

A. being faced
B. facing
C. faced
D. being facing
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