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第一节 单项填空(共15小题；每小题1分，满分15分)
从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
21、The driver was at ______ loss when _____ word came that he was forbidden to drive
for speeding.
A. a; the B. /；/ C. the; the D. a；/
22、Without the friction (摩擦力) between feet and the ground, people would ____ be able
to walk.
从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
21、The driver was at ______ loss when _____ word came that he was forbidden to drive
for speeding.
A. a; the B. /；/ C. the; the D. a；/
22、Without the friction (摩擦力) between feet and the ground, people would ____ be able
to walk.
