---
id: 67d803079b1a8384b2ac9aa6
title: Task 121
challengeType: 22
dashedName: task-121
lang: en-US
---

<!-- (audio) Lisa: That's strange. Our firewall settings are usually solid. It must have been something else. -->

# --instructions--

Listen to the audio and complete the sentence below.

# --fillInTheBlank--  

## --sentence--  

`That's strange. Our firewall settings are usually solid. It BLANK something else.`  

## --blanks--  

`must have been`  

### --feedback--  

This phrase is used to make a strong guess about the past based on evidence. Use three words.

# --explanation--

`Must have been` is used to express a strong logical conclusion about the past. For example:

`She is tired. She must have been working all day.` - You're confident she worked all day because she looks exhausted.

Lisa is sure that the firewall settings were not the problem and believes something else caused the breach.  

# --scene--

```json
{
  "setup": {
    "background": "company2-center.png",
    "characters": [
      {
        "character": "Lisa",
        "position": {
          "x": 50,
          "y": 15,
          "z": 1.2
        },
        "opacity": 0
      }
    ],
    "audio": {
      "filename": "B1_14-3.mp3",
      "startTime": 1,
      "startTimestamp": 19,
      "finishTimestamp": 24.06
    }
  },
  "commands": [
    {
      "character": "Lisa",
      "opacity": 1,
      "startTime": 0
    },
    {
      "character": "Lisa",
      "startTime": 1,
      "finishTime": 6.06,
      "dialogue": {
        "text": "That's strange. Our firewall settings are usually solid. It must have been something else.",
        "align": "center"
      }
    },
    {
      "character": "Lisa",
      "opacity": 0,
      "startTime": 6.56
    }
  ]
}
```
