The children ＿＿very quiet；I wonder what they ＿＿up to.
A．were； are beingB．a(chǎn)re being；areC．a(chǎn)re；doD．a(chǎn)re being；do
B
be用于進(jìn)行時(shí)可表示一個(gè)暫時(shí)的特點(diǎn)或表現(xiàn)。What they are up to相當(dāng)于What they are doing。
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