B. Fill in the blanks with the past perfect or simple past tense of the verbs in brackets.
试用括号里动词的过去完成时态或一般过去时态来填充空格。
Comparison Compare the difference between the simple past tense and the present perfect tense.
现在完成时与一般过去时所表示的动作或状态都发生在过去，区别…
Comparison Compare the difference between the simple past tense and the present perfect tense.
现在完成时与一般过去时所表示的动作或状态都发生在过去，区别…
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