单选题It was just at the moment______ he worked out the problem that he had long been puzzled about.AsinceBwhichCbecauseDthat
单选题
It was just at the moment______ he worked out the problem that he had long been puzzled about.
A
since
B
which
C
because
D
that
参考解析
解析：
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单选题It is a very difficult problem，but I think I shall worked it out by nine o’clock.AI shall work it outBI shall have worked it outCI shall be working it outDI must have worked it out