Colin was about to get off the camel ________ a child ran towards him.
A．whileB．whenC．a(chǎn)sD．since
B

試題分析：考查固定結(jié)構(gòu)：be about to do when…剛要做…這時(shí)…，句意：Colin剛要下駱駝這時(shí)一個(gè)男孩朝他跑過來。選B。
點(diǎn)評(píng)：和when常常搭配的固定用法還有：過去完成時(shí)（had done）…when…,過去進(jìn)行時(shí)（was/were doing +when…）。
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