单项选择题

Whatever his former conduct ______, his circumstance should exempt him from rebuke now.

[A] may have been
[B] can be
[C] had have been
[D] could have been

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单项选择题

However, as the evidence began to ______, experts from the Zoo felt obliged to investigate.

[A] accumulate
[B] amass
[C] assemble
[D] congregate

单项选择题

Going out for a holiday is a good way to relax and refresh yourself, and this is especially true ______ it comes to preventing depression.

[A] since
[B] before
[C] after
[D] when

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