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单选题
The new staff didn’t know how to use the system _____ I explained it to him yesterday.
A
until
B
because
C
if
D
since
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参考解析
解析：
本题考查连词辨析。句意：直到我给他做出解释之后，新成员才知道怎样使用系统。not和until经常搭配，表示“直到……才……”，符合本题题意。
本题考查连词辨析。句意：直到我给他做出解释之后，新成员才知道怎样使用系统。not和until经常搭配，表示“直到……才……”，符合本题题意。
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