_______ difficult it may be, we are sure to stick to our principle. [ ]A. H

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_______  difficult it may be, we are sure to stick to our principle. [     ]
A. How
B. No matter how
C. What
D. No matter what

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举一反三

—It"s a long time ________ I saw you last.
—Yes, and what a pity it is now that it will be a long time ________ we see each other again. [ ]
A. before; since
B. since; when
C. since; before
D. when; before

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—Why didn"t you try your best to get on the bus?
—I tried to, but ________ I could, it started moving.[     ]
A. until
B. when
C. before
D. after

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He had already walked three or four miles ________ he saw a cart, half-full of hay,
by the side of the road. [     ]
A. while
B. when
C. the moment
D. unless

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My grandpa sowed the flower seeds in the garden ________ it was the best time for them to grow. [     ]
A. where
B. when
C. that
D. until

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Much _______ the young couple needed money to make the down payment for the apartment,
they wouldn"t ask their parents for help. [ ]
A. although
B. as
C. even if
D. while

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