填空题

Only under telescope_______________________________________ (才能看得见那些星星).

【参考答案】

are those stars visible
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单项选择题
A．applyingB．doingC．offeringD．getting
A．applying
B．doing
C．offering
D．getting
填空题
Hard as they tried, they__________________________________ (没有找到替代品) for this material.
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