{01}—Can you work out the problem?
—I can"t ________ you explain how to do it.
A.but for
B.except
C.apart from
D.unless
解析：
本题选D。
{02}We were swimming in the lake ________ suddenly the storm started.
A.when
B.while
C.until
D.before
解析：
本题选A。
—I can"t ________ you explain how to do it.
A.but for
B.except
C.apart from
D.unless
解析：
本题选D。
{02}We were swimming in the lake ________ suddenly the storm started.
A.when
B.while
C.until
D.before
解析：
本题选A。
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