题文
. The latest job report gave a mixed picture of employment in the US, leaving investors without any clear sign ________ the economy is improving.
| A．which | B．that | C．what | D．if |
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. The latest job report gave a mixed picture of employment in the US, leaving investors without any clear sign ________ the economy is improving.
| A．which | B．that | C．what | D．if |
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