问题
选择题
This is certainly the case, but ____ it is a mistake or not I don’t know.
A．if
B．even though
C．whether
D．that
答案
C
引导宾语从句时,whether 和if常可互换,但如从句提前,则只能用whether。
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This is certainly the case, but ____ it is a mistake or not I don’t know.
A．if
B．even though
C．whether
D．that
C
引导宾语从句时,whether 和if常可互换,但如从句提前,则只能用whether。